[austinjp]

Ya, plenty of highly successful musicians and "composers" can't/couldn't read music, Paul McCartney being one of the most famous.

Joni Mitchell apparently didn't even use regular tab notation. She'd detune her guitar and annotate the relative pitch shift per string, e.g. D-2 G+1, etc or similar.

[midgetjones]

But luckily Paul McCartney had George Martin, who could do it very well :)