This interesting piece from Haaretz in 2013 touches on some points rife for further investigation: how to identify a niggun by its composer, the questions of whether and why to notate niggunim, and the happenin’ world of Hassidic academia. Haaretz’s bias is amusingly apparent here–I’m not sure who exactly is the Andrew Lloyd Webber of Hassidic music, but I hope they’d take it as the compliment it’s meant to be.
The Chamber of Song 