The Compilation below, courtesy from Ravial in our DA forums lore thread. You can see what sourcebooks to draw from below. ((From Races of Faerun 3.5, Complete Book of Elves AD&D 2e, Elves of Evermeet 2e, Cormanthyr: Empire of Elves AD&D and a bit of edited copy/paste from FR wikia)). There exist additional sources to draw from like also the Complete Warrior. Complete book of elves has the most cultural aspects tied to the craft. But in all the books, bladesinger is considered the prestige class for Sunelf, Avariel and the Moonelf.
The novel Evermeet: Island of elves occasionally settles on a bladesinger character but it delves deep in the culture of elves on Evermeet, the moonblades and also the legends of the Seldarine. A highly recommended read especially if your elf comes from Evermeet.
There also exists a novel named Bladesinger, which is part of The Fighter series. I've yet to fully read that one myself.
~Bladesingers~
An elite group of elven fighter/mages, the bladesingers are dedicated to the defense of the elven nation, and many of them journey back to Faerûn to help defend those elves who stayed behind or have yet to join the Retreat. Of the roving elves, there are few as deadly as the Bladesinger. They are masters of their weapons and have spent their lives in the study of their chosen weapons. They have also learned to cast spells while engaged in combat, and thus they double their might. Bladesingers are terrifying weapons experts and spellcasters. On Evermeet they are organized into small warrior lodges, each specializing in a different weapon. They are even more dedicated to the ancient ways and styles of dress than other elves. They often tattoo themselves with old runes and symbols and their armor and weapons are all of great antiquity and beautiful craftsmanship.
Bladesingers blended art, swordplay, and arcane magic into a harmonious whole. In battle, a bladesinger’s lithe movements and subtle tactics seem beautiful, belying their deadly martial efficiency. Bladesingers have a treasured place in elf society, balancing the joys of art and magic with the skill of masterful fighting, and so bladesingers are well-respected by other elves. They usually serve as itinerant guardians and champions of the elf community at large rather than tying themselves to one particular settlement. Multiclass fighter/wizards can become bladesingers most easily, though any elf who can wield a martial weapon and cast arcane spells can become a bladesinger. Bladesinging ranger/wizards, rogue/ wizards, and bladesinger bards are not unknown.
Most bladesingers work alone, sufficient unto themselves, but in larger communities they sometimes have the opportunity to fight together in the same combat. Bladesingers are normally trained singly by another bladesinger, and the concept of anything as formalized as a bladesinger school is an absurd notion to them.
Not only must they attempt to advance the cause of elvendom somehow at all times, they must also lend aid to any elf in need. Unless the elf is proven to be an enemy of the elven way of life, the Bladesinger must sacrifice life and limb to save that elf's life.
Of course, the Bladesinger is free to determine whether there is, in fact, an elf in danger. Too many times other races have tried to eliminate the Bladesinger menace through illusion and trickery. The Bladesingers have grown wary and have, unfortunately, allowed fellow elves to perish while trying to determine the truth of the threat. Thus, most Bladesingers carry at least one detect magic spell in order to avoid possible errors.
Bladesingers are so devoted to their chosen weapon that they can never learn another one.
On Evermeet and in other homelands of the Tel'Quessir, such as Evereska, there exists an order of knights dedicated to Corellon Larethian; the Weavers of Bladesong, of which the membership is comprised exclusively of dedicated Bladesingers or those who have learned the basics of the bladesong style as a supplementary skill-set to their own style.
In their travels they are treated with the utmost respect and admiration by the elves they meet, being treated as heroes in the communities they enter, much as a human Paladin would be in a human village. They are the champions of the Tel'Quessir, the Knights of The People and defenders of the elven way of life, practicing an ancient and honored elven art and giving their lives if necessary to defend elven society, and they are accorded status of heroes and the respect such due such a station whenever they are encountered
In ages before fall of Myth Drannor, bladesingers served in the both as armathors (Coronal Guards), the magical knights of Myth Drannor, and they were part of a special unit within the Ahk'Velahrn (Myth Drannor's standing army) known as the Protectors, which acted as both an elite unit within the army and as a special bodyguard unit to the nobility. They specialized in their realm's defense against magical monsters such as demons and dragons. In the ancient texts it is mentioned they invented spells such as creating an immense freezing space thus limiting their enemies' movement (often used against dragon's wings.)
~Bladesong~
The bladesong itself is an extremely demanding martial art, the epitome of Tel'Quessir mastery of the sword, almost never taught to those not of Tel'Quessir blood. The bladesong is a primarily defensive style of combat, with devastating strikes considered less important than a superior guard position. From this superior defensive posture, magical attacks and spells may be used without fear of successful counter-attack, when performed by a Tel'Quessir fully proficient in the style. In addition to the violent purpose inherent to all martial arts, the bladesong is uniquely Tel'Quessir in the fact that the aesthetic components of the style are as important as its martial efficacy, with its dance-like movements and the haunting whistling sounds produced by the sword blade cutting through the air being the source of the name bladesong.
These dedicated elf warriors take their craft seriously enough to have created a uniquely elven fighting style. Unlike the martial arts of other races, the elven fighting style, also known as the bladesong, emphasizes beauty and economy of movement over sheer destructive power. However, the elven bladesong is deceptively dangerous, for all its seeming gentleness and apparent grace.
Bladesong is so named for several reasons. The first and most obvious is because of the whistling of the blade as it slices through the air when this style of fighting is used. The second, according to some, is for the haunting, wordless tune many of its practitioners are said to sing as they fight. Other sources indicate that Bladesingers practice an ancient elven variant of the art of Spellsong which they have adapted to suit their uniquely elven arcane-martial style.
Those who practice the bladesong appear as if they are dancing when they fight. Their movements seem misleadingly slow and elegant, deflecting opponents' blades while lazily drifting back to score hits themselves. The technique requires, above all, misdirection and subtlety. The bladesingers do not believe in smashing blows or strong and crushing offense, but rather in guiding their opponents to anticipate a different attack entirely, thus overbalancing the foe and making him seem clumsy.
((From Races of Faerun 3.5, Complete Book of Elves AD&D 2e, Elves of Evermeet 2e, Cormanthyr: Empire of Elves AD&D and a bit of edited copy/paste from FR wikia))
