I'd had a general rule of thumb for years that less is more & it's better to have zero distractions. No floor to ceiling mirrors, as little outside noise as possible & definitely no music. But, I'm slowly coming round to actually enjoying it in the background when I practice & I've started using it in classes.
Now, I'm with the vast majority of folk (with any decent taste in music) who say that "yoga music" is truly awful (exhibit A) but there's loads of stuff I hear from time to time that really works. Just nice, mellow, backgroundy stuff that doesn't get in the way & become too distracting.
Here's my recent playlist....
The Firefly Dusk - Voice Of The Seven Woods
Can You Imagine Nothing? - Kikagaku Moyo
Music Is Love - David Crosby
Penobska Oakwalk - Quilt
It's A Sight To Behold - Devendra Banhart
Deadweight On Velveteen - Jose Gonzalez
Shingle River - Fern Knight
The Old Laughing Lady - Neil Young
Stone on the Water - Badly Drawn Boy
Chan Chan - Buena Vista Social Club
Mommy, What's A Funkadelic? - Funkadelic
Crosses - Jose Gonzalez
Scarborough Fair - Simon & Garfunkel
Terrapin - Syd Barrett
Porpoise Song (Theme From 'Head') - The Monkees
Grantchester Meadows - Pink Floyd
On The Road Again - Canned Heat
Super Falling Star - Stereolab
Quite folky & hippified but that's me
Still, I'm really open to suggestions of anything you folks think may fit the bill.
