Unlike most of his Toto bandmates, he generally did not contribute lead or even backing vocals; he considered himself a weak singer, and sang lead on two of his earlier compositions only because he felt that the vocal styles of his bandmates, with the exception of Joseph Williams, were not appropriate for his songs. The song "Rosanna" was supposedly inspired by Porcaro's girlfriend at the time, Rosanna Arquette but this has since been denied by the song's writer, David Paich, and Arquette herself.