Parents worked in the field of commercial jingles: His father was a composer and his mother was a singer
Sang backup on the Lionel Richie hits "All Night Long" and "Running With the Night
" Met his wife Cynthia Rhodes while writing a song for her film Staying Alive (1983); has also contributed music to the sound tracks for St
Elmo's Fire (1985), The Goonies (1985) and Tequila Sunrise (1988)
To promote his 1991 album, Rush Street, he performed five concerts in a 24-hour period, starting in Baltimore and finishing in Los Angeles
Wrote and produced the 2000 'N Sync hit "This I Promise You
" Wrote Keith Urban's 2011 country hit "Long Hot Summer," which gave Marx a run of four consecutive decades in which tunes Marx wrote or cowrote were chart-toppers
Was music producer for short-lived series The Playboy Club
Sang "The Star -Spangled Banner" at the 2011 Auto Club 400