Which Matchbox 20 song? I have their albums and I wouldn't say I'm a huge fan or anything...

This is what comes to mind, for no particular reason:
Norah Jones
The Eagles
Tom Petty
Bruce Springsteen
Anna Nalick
Goo-Goo Dolls (or at least "Iris")
Alanis Morisette
Madonna
Celine Dion

I could see her being into showtunes, too.