Music styles vary quite a bit. There's room for believers to enjoy music that's part of virtually any variety, so long as its content isn't unbiblical. In point of fact, many modern Christian artists are famous—or infamous—for producing circular music. Michael W. Smiths' "Surrounded" is notably (incredibly, obnoxiously) circular, and Chris Tomlin's "Good Good Father" loops into itself before it even gets out of the title. If hearing the same few words over and over is your kind of jam, then nothing in the Bible says that's wrong.
Some would argue all Christian music is pretty square. In contrast, rock-oriented groups like Skillet or Decyfer Down make music which is more triangular, featuring sharper edges. Laura Story and Tauren Wells are known for sounds which are smoother, but not necessarily circular. Those looking for a good mix of angles might prefer artists like Big Daddy Weave, Mercy Me, or Casting Crowns. Red, Demon Hunter, and Norma Jean are more like. . .scribbles? Hashtags? Whatever, it's not something you're going to find in a 1950's hymnal. The point is there's a
lot of shape variety in the Christian music scene.
It's also common for Christians to think the only music they can listen to is that which is overly religious. In fact, so long as the content is not sinful, there's nothing wrong with enjoying
secular music.