Yes, thumbs down on auto-play music, except perhaps on sites that are specifically about music, and even then, auto-play is probably best avoided.
Anything that keeps visitors on your site, hooks their imagination, gets them talking about you, earns you a link, brings them back, is worth considering.
Multi-media can be a compelling hook sometimes, even if it's not directly on topic.
Please forgive me, or yell at me, but I just have to share a free gadget I made for this very purpose.
It's a free portable music video player, that can be added to your site, featuring home made music and music instruction from a variety of sources.
Now it's time for a trivia quiz! :-)
The first song displayed in the player is from a truly wonderful music movie that recently received global acclaim.
If you know the name of this movie, post it here and win a, um, hmm, let's see....
A free movie player for your site!