She became a freelance singer, performing back up vocals with the Josephine Theatre (a local theater troupe), and singing in the band The Oh So Good!
While in Hollywood, she sang Celine Dion's "It's All Coming Back to Me Now" and Simon was very impressed with her vocals.
On May 12, 2007, Scarnato sang the national anthem for Game 3 of the Western Conference basketball semifinals between the San Antonio Spurs and Phoenix Suns.
On April 20, 2009, she sang the national anthem for Game 2 of the NBA Western Conference First Round between the San Antonio Spurs and the Dallas Mavericks.
Haley's now-unavailable EP of studio version songs that she performed on American Idol was released on iTunes, along with all the other Top 12 contestants.
In 2012, Scarnato released her new country single "How I Feel" written by Dan Hill and Keith Stegall.