I'm not really up to date on music, especially indie artists, but I really don't think it is an indie artist. I mean, Fozzy was played for a while, which was rather surprising for a grocery store radio station, but this band doesn't really sound indie. It just sounds like an 80s love ballad. I wish it was played as much as the shitty yodeling metal cartoonish wail song so then I could get some more lyrics.
Also, I'm not sure an app would work as even though the best and clearest speaker is in the back room, it's still high up.