If you didn't know what solipsism meant before checking out this song, don't feel bad, because I didn't have a clue either. According to a quick Wikipedia search, it means: “the view or theory that the self is all that can be known to exist.”
The definition makes sense, especially after seeing how Fenne Lily describes the track, saying:
“Solipsism” is for anyone who has been or still is scared of everything — for anyone who feels like Louis Theroux at parties — for myself looking back on 21 as a weird time, not the end of the world.
At first you may mistake this track for incorporating a heavy amount of synth, but I didn’t pick up on hardly any after listening more intently. Instead, the song relies on rad drums and guitar to maintain its rock roots. Although her fierceness and fire are subtle, they are certainly there.
And don’t forget to look out for hints of piano softening things up, which mixes in so well with the drums towards the end of the song. Lily is able to take two instruments that usually contrast and perfectly intertwine them.