Who composed the theme song for the movie Marvin's Room?

Context: Marvin's Room is a 1996 American drama film directed by Jerry Zaks. The script was written by John Guare and based on the play of the same name by Scott McPherson, who died in 1992. McPherson had completed a screenplay for a film version before he died; however Guare was hired to update it when the film eventually started production years later.

It stars Meryl Streep, Leonardo DiCaprio, Diane Keaton, Robert De Niro, Hume Cronyn, Gwen Verdon, Hal Scardino and Dan Hedaya. Original music for the film was composed by Rachel Portman. Carly Simon wrote and performed the theme song "Two Little Sisters", with Meryl Streep adding background vocals.

Answer: The musician that composed the original music for the Marvin's room was Rachel Portoman, and Carly Simon wrote and performed the song.