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.
While this platform is primarily for streaming, you can find links to purchase specific albums or songs that will open in your device's native store or allow for account-based digital additions. buy itunes music without itunes
The music will then appear in your library across your devices. If you are on an iOS device, you