Music data is installed in correct spot, at least judging by the relative paths in vegastrike.config. Ship sounds (lasers) works, no engine noise (can't remember if there ever was) and Oswald's tutorial can be heard and run through. You, uh, can also hear his shields being impacted by the aformentioned lasers.
An strace bogged the system down that no useful info was captured prior to my patience wearing out and nothing related to music or ogg appeared in the usual console output. Some GL warnings present and an error relating to a missing units.csv.
Linux vader 3.6.9 #1 SMP PREEMPT Thu Dec 6 14:12:39 EST 2012 x86_64 AMD Phenom(tm) II X6 1090T Processor AuthenticAMD GNU/Linux
ogg123 from vorbis-tools 1.4.0