The title gives away the ending: "だから僕は音楽を辞めた" (so that's why I quit music). The whole song is the narrator explaining how they got there, and it starts small. They're waiting for someone under a blue sky, imagining slipping out of a lazy afternoon, and admitting "進め方教わらないんだよ" (nobody teaches you how to keep going). My favourite detail comes early: "辞めた筈のピアノ 机を弾く癖が抜けない" (I'm supposed to have quit piano, but I can't shake the habit of playing on my desk). You can picture the fingers drumming on the table. They quit, and their hands didn't get the message.
Then it gets angry, fast. The narrator turns on everyone with "あんたら人間" (you humans), a rude, distancing way to address people, as if they've stepped outside the species. They hate people with happy faces, they feel a "化け物みたいな劣等感" (an inferiority complex like a monster) at the back of their head, and they call even flinching at love songs a "防衛本能" (defence instinct). Watch how the chorus flips between "間違ってないよ" (I'm not wrong) and "間違ってるんだよ" (it's wrong); they can't settle on it. The bitterest line is the shrug "歌詞とか適当でもいいよ" (the lyrics can be any old thing), sung inside a song with very carefully written lyrics, which is a bit of a joke at its own expense. Near the end the armour cracks: "何度でも君を書いた" (I wrote about you again and again), and selling records never mattered. For learners, notice "〜筈" (supposed to have) and the casual "〜し" at the end of lines, which stacks up reasons like "and also...".
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