"I Wanna Marry You" is a tender, doo-wop-inflected ballad from The River that showcases Springsteen's romantic idealism at its most earnest. Set at a gentle 111 BPM in D, the track features a warm, melodic tenor saxophone solo from Clarence Clemons that perfectly captures the song's dreamy, lovestruck atmosphere. Clemons's solo is one of his most lyrical on the album, with long, singing tones that float over the arrangement like a love letter set to music. The composition draws heavily on the girl-group and doo-wop traditions that Springsteen has cited as formative influences, with its simple chord progression, backing vocal harmonies, and gently swaying rhythm evoking the innocence of early 1960s pop. The lyrics present an unguarded declaration of devotion, describing a man watching a single mother and imagining a life together, delivered with a sincerity that borders on vulnerability. The E Street Band's accompaniment is delicate and supportive, with glockenspiel, piano, and organ creating a shimmering sonic backdrop. I Wanna Marry You occupies a crucial position on The River, paired with the title track to create an emotional one-two punch that juxtaposes youthful romantic fantasy with the harsh realities of adult life.