After Massi rejoined DeVito and Valli (who by this point were joined by keyboardist Bob Gaudio), the group evolved into the Four Seasons.
He took a scientific, "open harmony" approach to his arrangements that differered from the improvisational style of doo-wop groups before him.
[9] Much like his successor Joe Long, Massi had occasional reunions with the band after his departure, most prominently for a stretch in the 1970s.
[11] In his latter years, Macioci, reverting to his birth surname, took up painting as a hobby; his daughter Patti has published many of his paintings online, consisting of a broad variety of styles but most commonly featuring portraits of celebrities and figures associated with his Catholic faith.
[14] Massi died of liver cancer on December 24, 2000, allegedly brought on by "alcoholism and other demons," at his home in West Orange, New Jersey.