If the book is a collection its a Songbook. Usually the music of an album of the same name, or greatest hits, etc. I’ve sold them in the past (not on this site) for about $8 to $40. You will find some listed higher on the big sites. Some are rarer than others. Condition is important for price, but seems even poor condition ones will sell if its an important or rare one. Guitar teachers, cover bands, students, collectors, will buy them. I think most of them are usually guitar/piano. That’s all I know from experience, not a regular music/book seller.

Montrose,
You could try using Kovels

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A Score, is typically sheet music that includes all parts played for the instruments it is written for. In the case of Classical music, it would have all the parts for strings, brass, woodwinds, percussion and piano. They are used by a conductor to be able to see what each group is playing all at the same time… Scores are usually much thicker than individual sheet music for each instrument.

Wish I had some money…My 14 yr old daughter is a music fanatic over 70’s music and would love to have all of those. She plays guitar.

Thank you for your time with all this valuable information now completed and researched ~ Montrose