The best No 1 records: Kylie Minogue – Can't Get You Out of My Head

After the cheerful hot-pink disco of Kylie's previous chart-topper Spinning Around, Can't Get You Out of My Head was sleek, Arctic-blue minimalism, like an emotionally thwarted retelling of Donna Summer's I Feel Love. The precise context of the song is a mystery. Is Kylie addressing a partner, an evasive one-night stand or someone who doesn't know she exists? And what's her "dark secret"? All that's certain is that her longing, like the locked, robotic groove, will never find release. Her obsession is as nagging as that "la la la": an earworm of the heart.

See every No 1 hit from 2001.