Well, i've played enough music on the violin, progress was s-l-o-w.
I was on Suzuki book 3 with my old teacher, and when I changed teachers, it was group lessons, so she made me do pieces from 'fiddle time runners/sprinters',

, which was far too easy, and after 2 years of not progressing well, I'm now on suzuki book 4 with quite hard stuff all because of PRIVATE LESSONS!!! The same teacher, but makes a difference
I think that if I moved straight on to suzuki book 4 when I finished book 3, my note-reading wouldn't have been good enough though...