App Annie, a company that tracks app analytics, has released their 2013 retrospective. They used App Store and Google Play data to compile this list of the top 10 music apps, sorted by revenue.
Total music app revenue in 2013 went up 77 percent from 2012. Most of the revenue came from Apple’s App Store.
The report doesn’t touch on how much of this revenue is turning a profit, so it’s quite possible that these apps spent a lot more in 2013 as well.