First step of download goes completely fine, when it gets to the second step however, it crashes the game and goes back to the marketplace.
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Can you please try clearing any other downloaded packs that you don't need, and then download it again?
Launch Minecraft
Go to Settings>Storage
Delete the packs you don't need
Close and restart Minecraft
Download the music pack again

I don’t have any other downloads, I’ve tried to download it 3 times now after closing and restarting the app. I have plenty of storage on my phone. So I don’t know what the problem is.

Thank you for your report!
We're actually already tracking this issue at MCPE-45754, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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