Can’t buy music from iTunes without accepting 3 month trial?

I don’t want a subscription to iTunes. I just want to buy and download a recording of harp music in the iTunes store. But when I try to buy it, the 3 month free subscription pops up. When I decline it, I’m taken back to the iTunes page that shows the piece of music I wanted. Then, when I try to buy the music again, the 3 month free subscription pops up. Again. When I decline it, I’m taken back to the iTunes page that had the piece of music I wanted. This is an infinite loop. How do I buy the mp3?