@landstalker I think I have to second lightningcloud here. For the music to be up to par you'd need the actual audios or somebody who is ridiculously good at playing like Jimi as well as someone who is just as good at playing like Kurt. The former doesn't go well with copyrights, as you said yourself, and the later has a harder time to bring out the excitement. Manga at least doesn't need to incorporate music.
On another note, do you watch anime after reading the manga? I sometimes read the manga (if it is the source material) after watching the anime but never the other way round, as I always tend to find faults with the adaptations