Smyth subsequently co-wrote the 1994 song "Look What Love Has Done," nominated for a Grammy and an Academy Award after its inclusion in the soundtrack to the feature film Junior. Further soundtrack commissions resulted in her writing and composing the theme tune, "Wish I Were You," to the 1998 feature film Armageddon. (Her husband, John McEnroe, claimed in his autobiography that she was inspired to write the song by his own attempt at a musical career; she was struck by his excitement at playing music, when her own feelings about the music industry were much more ambivalent.) In 1999, Smyth sang lead vocals on "Ode To Billie Joe," a cover of the 1967 Bobbie Gentry hit, on the album Smokin' Section by Tom Scott & The L.A. Express.