What is the most popular song in musical cats?

The most popular song in the musical Cats is arguably "Memory". Composed by Andrew Lloyd Webber, with lyrics by T. S. Eliot, the song is a powerful ballad that reflects on the joys and sorrows of life, and the transience of time. It is a poignant and emotionally charged piece that resonates deeply with audiences and is often regarded as one of the most memorable and beloved songs in musical theatre history.