Have you tried appealing to the musician? They might be flattered enough to help or direct you to someone to their agent... if the musician is deceased, you'd be best to contact the estate.

If nothing else, you should get permission so you don't get sued.

Hi. Congrats again on your book! Promoting your book is key after it is already published and after finding your niche market, you can then focus on marketing your book there.

You can actually seek promotional help through self-publishers such as Xlibris because they have programs that can help self-published authors gain maximum exposure from being listed at the Library Journal, being on book shows, being reviewed by Kirkus and all that jazz.

You can check out the website here:

www2.xlibris.com/marketing_services.html

or get free information here:

www.xlibris.com/requestkit/index.asp