Yup, that's what mister-e's calculator says with 40mhz, 1:1, and 16-bit. 152 hz.
The PIC18F2331/2431/4331/4431 series has a bunch of 14-bit PWM modules. But they are completely different from the CCP module.
Bruce has done a few examples, but I don't think any of them were for music.
best regards,
Bookmarks