JJ2 Boss theme 2 is by Robert A. Allen and Bryan Rudge.

"Streetwize" is by Alexander Brandon but incorporates a theme from "Dope for Your Mind", which was written by Otis/Perseus and remixed by Basehead (Dan Grandpre) - the borrowing is based on the remix and in the sample comments Alex wrongly states that the song is solely by Dan.

"Water Level", again, is by Alex B. only, but it's based on the original Metroid theme by Hirokazu "Hip" Tanaka.

It's unclear who wrote the Sugar Rush theme. An obvious bet is Alex, but to me it doesn't sound like his style.

JJ3 demo's "Haunted Terrero" was written by Bass Productions.

All JJGBA music was written by Manfred Linzner.