Compare feminine hygene and children singing in The Waste Land (and consider that in the soldier's ballad it was not feet that were washed):
And in this passage from Eliot's Ode (1920):
O the moon shone bright on Mrs. Porter
And on her daughter
They wash their feet in soda water
Et, O ces voix d'enfants, chantant dans la coupole!
[And, O those children's voices singing in the dome!]
When the bridegroom smoothed his hair
There was blood upon the bed.
Morning was already late.
Children singing in the orchard
(Io Hymen, Hymenaee)
Note also the playing of music after sex in the typist section:
You may want to view the cross references for music, songs and singing for similar comparisons.