You probably figure that if Izzy knows this song she's likely a Supertramp fan. But you'd be wrong because Izzy only knows about like 4 or 5 Supertramp songs and doesn't have much interest in exploring the rest. Of course, her even knowing that many Supertramp songs at her age is kinda remarkable. I don't even know if I know that many Supertramp songs.
That being said you may see another of these songs later in the comic. I'm still working that out.