I don't know if I have any idols in music, but one of my favorite artists is Neil Young, from way back in the day until more recently. Always welcome hearing a good Neil Young song, anytime.
Can't say there is any singer, or group, that I like all, or even most, of their songs. It's on a song by song basis with me.
I like most of Carly Simon's songs. Maybe that's because I think I'd like her as a person.
And Leon Russell, because his style is so unique and haunting: Bluebird, Lady Blue, Tightrope, even Back to the Island Oddly enough his most famous song, A Song for You, I don't care much for.
Same way with Carly Simon. Never cared much for You're so Vain. I always liked the second tier songs better. Never quite with the in crowd, I guess.
I wouldn't call anyone an idol, but I do like a lot of different kinds of music.
Right now the first thing that pops into my head is Springsteen's "Bobby Jean". Ask me 5 minutes from now and it will be something else. I guess I'd say my favorite song is whatever I am listening to at the moment.