SoundCloud allows autoplay like this:
http://w.soundcloud.com/player?url=api.soundcloud.com/tracks/18367141&auto_play=1
I am trying to do this with Bandcamp. I tried these without success:
http://bandcamp.com/EmbeddedPlayer/track=3873199620/autoplay=1 http://bandcamp.com/EmbeddedPlayer/track=3873199620/autoplay=true
Best Answer
From https://bandcamp.com/help/audio_basics#autostart
In other words, Bandcamp doesn't support autoplay.