Downtempo

Downtempo may have a variety of names ranging from ambient (with beats or beatless), chill-out, and even instrumental hip-hop, but it has a shared sound. It's often slower-paced, gentle, relaxing, and sometimes trippy.

Check out these artists who specialize in this style of music.

Feel free to recommend some artists not included in here (these artists specialize in it) or include up to 10 of your favorite acoustic tracks  in the comments section (for an eventual best of countdown).