I think a "song" is, like, just play it on the guitar and sing it. You look out and see thousands of covers of "Animal" for example, so you think, "That was probably a pretty good song, because people feel like it's satisfying to just play it with one instrument accompanying it."
"My Trigger" is the best combination of song and track. "Heart Is Full" is maybe the best song we've done as a song, and that's why we try to play it in different ways, too, because I think for a lot of people the track was a bit distracting from the song.