That's my cousin and my dad behind me holding down the guitar action for a living room jam session back home in Maine. Off to the side we've also got my mom on cello and my sister's boyfriend on bass. By popular request we played Elton John's "Goodbye Yellow Brick Road", and I made up some lead sheets ahead of time (lyrics and chords). It's always helpful to label sections of lyrics with "VERSE" and "CHORUS" and "BRIDGE" and such, but sometimes there are more sections than you have labels and you have to get creative - like, what do you call that beautiful and wordless high-wailing part in "Goodbye Yellow Brick Road"? If you imagine the song for a minute you'll know just the part I mean. Is it the chorus? Is it a bridge? But I'd already used those labels for other parts of the song! So I went with "INSTRUMENTAL SURGE" and we had great fun referring to that section as we worked on the tune. We had to rehearse the SURGE many times and got my cousin to play some lead guitar on it, and it was sounding pretty fine after a while.
Incidentally, if you squint at the old photograph over my cousin's head you'll see a little girl in a white dress in the bottom right corner. That's my great-grandmother, the only girl in a violin class from more than a hundred years ago.