: A great way to support artists directly; you can purchase and download music in various formats (MP3, FLAC, etc.) via the Bandcamp website.
If your goal is to avoid the Apple ecosystem entirely while still getting high-quality digital files: buy itunes music without itunes
: You can buy MP3s directly from the Amazon Digital Music Store and download them to any device. : A great way to support artists directly;
If you want to add credit to your account to buy music later without navigating the store interface immediately: Buy an Apple Gift Card from major retailers or online. If you are on an iOS device, you
If you are on an iOS device, you don't need the "Music" app to buy songs; there is a dedicated storefront. Open the app (the purple icon with a star). Search for the song or album you want.