Twitter will discontinue its #music app on Friday, April 18. Conveniently, April 18 marks the app's first (and obviously last) anniversary. Yup, Twitter #music is officially dead. As part of the move, the micro-blogging startup has already pulled the free iPhone and iPad application from the App Store.
Whenever a piece of software gets removed from the App Store, it becomes unavailable for download or re-download so folks who plan on continuing to use the music discovery app have better backed it up in their iTunes library on their computer.
If you only keep Twitter #music on your iOS device, transfer it to desktop iTunes by connecting your device to a computer and choose the Transfer Purchases option nested under iTunes' File > Devices menu...