Recommended Reading
Here are some of the books I recommend to students during the courses. They do link to Amazon as I have an Associate account with them so if you make a purchase through these links I do receive a small commission - thank you
Royalty-Free Music
I recommend that practitioners use royalty-free music during their treatment sessions and here are a few of the sources I have found. They vary in price depending on the nature of the licence purchased.

Reiki Sound Essence by Aroshanti
Three tracks lasting just over an hour.
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Aroshanti offers 2 licence options - Practitioner & Royalty-Free

Reiki Relaxation by Aroshanti
Twelve 5-minute tracks, totalling one hour of music.
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The best option is the Practitioner licence.

Tao Relaxation by Aroshanti
Seven tracks with running time of just over 46 minutes.
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Practitioner licence is free and related to purchases

Zen Relaxation by Aroshanti
Seven tracks with running time of just over 57 minutes.
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Practitioner licence available for CDs & MP3 downloads only

Rob Hulford
This UK composer offers a choice of 12 month plans where by you can choose which level of licence you want and you will receive 12 albums each containing one track in 3 time formats : 15 mins, 30 mins and 1 hour.
Enlightened Audio
Australian Christopher Lloyd Clarke's website. He has a wealth of music on this site, however it is more expensive as a very comprehensive licence is included. Also offers a discount scheme.
iChill Music
One of the cheaper options, with a wide range of music. Available as CDs, MP3 downloads, web player and an App for streaming. Personally I'm not so keen on the music on this site but it's a great place to start.

Alpha Music
John Levine's website where he has a special offer for therapists. You purchase a licence annually and every time you renew you can have a free CD.