brand new music approved on the assetstore:
“Covered spy”
A simple short loop for spy games or similar. Instruments are drum, bass and guitar. The feeling (both sound and mood) is somewhat “old”, remembering the TV movies of '60 - '70. It will seamlessly loop so it is suitable for menu music, credit screen, presentation videos and so on.
just 2$ 
and find it in the asset store
do not miss my other music collection!
you can also download a ZIP file with all my demo music
how to you get it seemlessly played in unity? just restarting it when it ended will give a noticable seam, also playing it as loop…
are you talking about the demo on soundcloud?
that should be an mp3, the encoding is somewhat adding something at the beginning/end and so the demo can not be looped.
the asset is a wav and should seamlessly loop because it was properly edited.
actually, do not ask me how to achieve a loop inside unity because i’m a musician, not a unity-developer!
but i can say that i have sold other loops in the asset store and no one came back to me asking how to loop them… :-/