Most Influential American Musician of All Time?

Bill Monroe - perhaps the only undisputed creator of a genre of music and who is in the bluegrass, country and rock n roll halls of fame. Honorable mentions - Jimmie Rodgers and Les Paul.

Here is how I would break it down:

Country: The Carter Family
Folk/Rock: Dylan
Jazz: Armstrong
Classical: Solti

Frank Zappa was the most gifted musician in the last 100 years, maybe more. He wrote and played music that very very few people would ever attempt, let alone do a credible job. RIP Frank...

Aaron Copland

Read the Book Louis Armstrong A life by Bergrand (?) was on Time s best seller list and is a jazz book wose prose and historyography is above all the others.Yes he created the INDIVIDUAL musician with his soloing.The best Jazz/Drug/Prison book is Sraight life by Art Pepper.Blue People by Leroi Jones in interesting too.But I'd say you'd need a list.Armtsrong and Bing Crosby created modern singing in 20's.Yould have to make list.Ellington,Armsrong,Charlie Parker.Miles,Elvis,Dylan,Beatles,Stones,Zepplin.Maybe the most polytheistic guy was Ray Charles who could sing and play in any bag.But it's hard to deny many of he above.Zappa was genius.As were Bernstein.......But you have to take the question in terms of idiom."Music" is just too broad.The one thing s in the Classical arena not many voices extend beyond Stravinsky in 1904.Maybe Bartok but I might not even have right century.
Chazz