deleting music off phone

Sounds like some unexpected behavior going on there. Might seem like the worst thing in the world, but can be easily fixed. Given the issue you are having there, I would suggest transferring any purchases that are on the device alone back to iTunes and then restoring the iPhone back to factory (but with iOS 9b3 installed).

EDIT:

Also when setting the iPhone back up, avoid restoring any backups and ensure that you're using manual syncing! This is important; otherwise iTunes and iOS will sync based on one library and when testing betas, you don't want to hit a random bug.

I have a general idea what youre saying, but step by step would help a bit.....mostly restoring phone w/ fresh copy of ios 9 b3

To restore:

- Connect iPhone to your Mac

- Click File>Devices>Transfer purchases from "This iPhone Name"

- turn off Find my iPhone if it is active (iCloud settings on device itself)

- Hold option down on the keyboard and click 'Restore iPhone' under Summary in iTunes

- Choose the appropriate IPSW and follow the prompts

Basically a modified version of https://support.apple.com/en-us/HT201252

Nope, I thought wrong. I can delete songs individually, but what a PITA. In settings, when I select usage>music the setting screen just crashes. I can't be the only one here with this issue. Suggestions?

Same issue here, so you're not the only one. I am left with 3 gigs of songs, that stay, whatever I do. The same crash happens on the usage>music page.

Ok. Good knowing there's a glitch going and that glitch wasn't me.