Q: how to download music in El Capitan

Hi moonstonemountain,

Looks like you are having some issues with downloading songs in iTunes? No worries! Downloading content from the iTunes and App stores are designed to be intuitive. When running into download issues, checking to make sure iTunes is up to date is essential. We also want to make sure the payment type associated with your Apple ID has enough funds to cover the cost of your download. Take a quick peek at the links below for some great steps to help resolve your issue.

iTunes 12 for Mac: Buy or download items from the iTunes Store

Get the latest version of iTunes 

Payment methods you can use in the iTunes Store, App Store, and iBooks Store

These steps will get you on your way to downloading your songs as you wish. Thanks for using Apple Discussions to resolve your issue. 

Cheers.