Music to teach to has to fulfil some simple rules for me. Instrumental only, evocative and if there are nature sounds too then all the better. I'm lucky that I teach in a space with a lot of natural light and birdsong just outside the windows. The music I play when teaching has to complement that so I often use ambient music.
I was sent an album of yoga music produced by Group Fitness Music to review and played it when teaching my regular class. It was beautiful and just the right combination of soft and lilting while also providing a yogic atmosphere. The tracks are fairly short so if you wanted to use just a few it would work for a mini meditation and it was long enough for the whole hour lesson. When I teach a longer class I play it on a loop without an obvious break.
The music is PRS license free so you can use it at no cost. If you are a fitness instructor you could use this for stretching or relaxation. I asked my students what they thought of it and they really enjoyed the music and found it complemented the yoga really well.
The album can be downloaded from iTunes, Amazon and Google. If you are old school like me you can also get a CD.
Disclosure: I was sent a copy of the CD in return for an honest review.