The Silver Guitar: A Julie Mystery (American Girl)
by Katheryn Reiss
Ages: 7-9

Set in the 1970s, this is an old fashioned mystery similar to something you would find in an original Nancy Drew book,.  The main character is a typical girl of the time, she is interested in social issues like an oil spill killing birds and looking at different sides of an issues.  Julie's friend T.J. gets into some trouble and Julie helps solve the mystery. 
I would feel comfortable giving this to 7 through 9 year old girls I might go a little younger... chapter book with help from Mom or Dad? I think so.  However, I wouldn't go any older.  The main character is a realistic 10, but the way some of the details are repeated makes me think the author is trying to remind a younger reader of some details.
Where did I get it? My local library. No, I wasn't trolling the kids section, someone donated (thank you!) tons of duplicates and I was told to take whatever I wanted. So I grabbed a bunch.  By the way, this is a really fast read.

Reviewer's note-I really like the Looking Back: A Peek Into The Past section that gives readers a little non-fiction that might get them looking up music of the 70s.
Would I read more American Girl books? sure, as long as they stay interesting.  Will I give them to kids I know? Absolutely, they have an entertaining fictional story in a historical setting that is still relevant.
Where can you get it? Amazon, or your local library might have it, or you could have mine.  2 of my nieces are too old, and 2 are too young.