From CD #1:
Love's Old Sweet Song
Music by J.L. Molloy;
words by G. Clifton Bingham
This is one of the most frequently referred to and significant musical allusions throughout Ulysses. Molly Bloom will be singing this song on her concert tour with Blazes Boylan and, indeed, the afternoon liaison between her and Blazes is ostensibly for the purpose of rehearsing the music for that concert, including this song. Bloom learns that the song will be included in the concert tour early in the morning, and it serves throughout his day and the novel Ulysses both as a leitmotif of Molly's adultery and as the theme song of her potential reconciliation with Bloom.
[from CD liner notes, contributed by Prof. Zack Bowen]