I dont play audio on my mac. Ive got a PC for that. Ive got a KVM switch and the speakers are set up on my PC so I download all my music with that. But on the offchance that I am playin stuff on my Mac I use
Whamb, and before that good old
MacAmp Lite X. For video, VLC does the job. On OS9 i used Audion for some reason but never used it when i made the switch to X.