Ha - the Janis Ian song is the first one I went to.I think you're probably right, i listened to it again earlier and it matched more the more i listened, also, the whole Amy repeatedly mentioning 17 backs it up so i figure there's a far better chance it's this song than the Barry song.
Still, i suspect the Barry song was what it was reminding Bargle of as that's what it reminded me off too.
I think it's also interesting that Ian sings about learning the truth about love at 17, which is not an age any of Sensei's class has reached yet - they have not yet had a chance to "learn the truth".