ableton live on a powerpc g4 running tiger osx 10.4.11 -- Version 8.42 seems to be a tiny bit too much for the cpu.. or the gpu... (which is a radeon 9000 pro in this case) anyway according to the interwebs::
Live 8 Version: 8.4.2 (updated February 3, 2014)
pretty safe to say that a powerpc app that was updated + released in 2014... is not gonna be optimized properly for a powerpc g4. but we can check the last versions of ableton live 8 here:
https://www.ableton.com/en/release-notes/live-8/ errr actually no that doesnt tell us much because it doesnt say anything about initial version of 8.. which was released on 2 April 2009
https://www.ableton.com/en/press/press-archive/press-archive-release-8/ even in 2009 its highly doubtful that anyone was properly tweaking things for performance on a power pc g4! given that most if not all software companies abandoned the platform in 2005. so even tho ableton live 8 works on tiger 10.4.11.. its probably best to use v7!!!! instead of v8
heres a link for live lite 7 - this version should be good to go on a powerpc g4,
requiring no license (demo mode)
https://www.macintoshrepository.org/74415-ableton-live-lite-7-0-13