Erskine has worked on many Disney projects, including arranging songs for Pocahontas, Enchanted, and assorted sequels (including two Winnie the Pooh movies). He adapted and composed additional music for the 1997 TV version of Rodgers and Hammerstein's Cinderella (with Brandy), scored the TV movie Geppetto, orchestrated Once Upon a Mattress, and wrote a song (with Friedman) for The Lion King 1 1/2.
Apart from Disney, Erskine co-composed the score for the movie Heights with Ben Butler, composed for the children's series Wonder Pets! and Peg+Cat, and arranged the song "Star Spangled Man" for Captain America: The First Avenger. Off-Broadway, he orchestrated Forever Plaid.