Why do I have to wait 72 days to listen to the music I paid for

Have you been switching Apple ID users on your devices?

View and remove your associated devices in iTunes - http://support.apple.com/HT204074 - What this is saying is for certain actions such as turning on Match, Apple Music, Family Sharing, automatic downloads, or re-downloading of past purchases there is a 90 day waiting period between associating [using] a computer or mobile device with a new Apple ID . There is no wait for making new purchases.