Best way post quality sound clips is to use SoundCloud

1. upload your music to SoundCloud
2. click on the share button (top left of SoundCloud clip bar )
2. Copy link
3. on the BGT forum Post editing box -- you will see the SoundCloud icon on top of the box (row with all the editing tools) - click on it
4. Paste the SoundCloud url between the tags
5. Save -- that is it!