Two songs are involved in Happiness Seeker:
Dvorak’s Song to the Moon and
He Ain’t Heavy He’s My Brother by the Hollies.
Of the songs I listened to while I was writing the novel, my favourite include:
Hold my Hand by Lady Gaga
I was lost until I found you by Stephen Sanchez and
Songs from La la Land and A Star is Born (Lady Gaga again!)
I’ve also listened to Rachmaninov’s Second piano concerto which feels to echo the events of the novel so closely.