how to browse itunes to buy music
how to do a search to buy a song on itunes
MacBook Pro
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Search for music in Music on Mac - Apple Support
"Search the iTunes Store: Enter what you’re searching for (such as an artist or album name), click iTunes Store on the right, then select a suggestion or press Return.
If you don’t see iTunes Store, choose Music > Preferences, click General, make sure iTunes Store is selected, then click OK."