Hey folks!

I was just wondering, are there any books on singing? I don't mean books in such a sense of theoretical knowledge or understanding how to do certain things, i mean more in a sense of exercises to improve your singing, tone and such. Like for piano we have books like "The Virtuoso Pianist" by Hanon and for guitar there are books like Rock Discipline by John Petrucci. (Maybe not the two best examples, but that's what i was going for)

Are there any books in this kind of style for singing? Any good recommendations?

Thanks in advance
Fusion and jazz musician, a fan of most music.

Quote by Guthrie Govan
“If you steal from one person it's theft, and if you steal from lots of people it's research”

Quote by Chick Corea
"Only play what you hear. If you don't hear anything, don't play anything."