If you prefer streaming over owning individual files, the app on iPhone 6 supports Apple Music (provided you are running iOS 8.4 or later). Cost : Requires a monthly subscription fee.

: Ensure you are signed in under Settings > [Your Name] > Media & Purchases (or iTunes & App Store on older iOS versions).

: Look for the purple icon with a white star.

: Tap the Price button next to a song or album.

To buy music on your , the primary method is using the iTunes Store app , which remains functional for purchasing individual songs and albums even on older iOS versions. How to Buy Music via the iTunes Store

Select to see your history and tap the Cloud icon to redownload items to your iPhone 6.