I don't know if anyone has mentioned this before, but I find Megumi Ogata's image song for Yukito, Jitensha ni notte / Riding My Bike, absolutely infectious.
Haru ga yatte kita kyou wa ii tenki
Spring has come, and the weather is nice today.
Neko mo yane no ue akubishiteiru yo
Even the cat is yawning on top of the roof.
Sensei looks outside at the gorgeous spring weather and wonders why he's sitting at the computer and not at least listening to this song instead...But truly, I think Tooi Kono Machi de, the ending theme for the First Movie, is pretty hard to beat.
Daisuki datta ano uta
furui teepu no naka
chiisana na kizu iro aseta taitoru .
nijinda yoake
A song I love
is on this old cassette tape..
Its case is scuffed, its title card is faded ...
like a daybreak wrapped in mist.
Shivers all over.