Music subscription push

I used Itunes previously to purchase all my music. Now it is no longer available on my new MacbookPro. When i try to use Music on my Mac a subscription service is constantly pushed down my throat. I want to buy one song and download it! What happened to Apple? No more choice? I need one song for a slideshow for my family. I now have to purchase third party apps to do this job? Anyone know the solution?