Aaron Roderick Gillespie (born July 18, 1983) is an American musician, best known for being the original and current drummer and clean vocalist for the rock band Underoath[1] and the lead singer and rhythm guitarist for the alternative rock band the Almost.

[3] Gillespie also maintains his own solo project and released his debut full-length album, Anthem Song, in 2011.

[12] Gillespie did guest vocals on the song "All About Us" by indie pop band He Is We, which was released on the album "My Forever" on November 23, 2010.

[13] Gillespie has discussed his issues with hypochondria and generalized anxiety disorder, stating that they played into his departure from Underoath.

Most of the lyrics on the album They're Only Chasing Safety are written by Gillespie and are about him ending a four-year relationship.

2 on the Billboard 200 selling over 98,000 copies in its first week, the record was certified Gold by the RIAA on November 11, 2006, representing 500,000 shipped units of the album.

[15] On April 5, 2010, Underoath announced that the band and Gillespie had agreed to mutually part ways pending the end of their European tour.

[17] On August 17, 2015, in an interview article for Alternative Press, Chamberlain and Gillespie confirmed that the band was reuniting.

Gillespie recorded every instrument on the Southern Weather album except for bass on a couple of tracks, with which Kenny Vasoli from The Starting Line helped.

[19] In an interview released on February 8, 2015, on Emery's BadChristian podcast, Gillespie stated that he had placed lower priority on the band, citing his "busy schedule" (as Paramore's touring drummer, a solo artist and producer) and the "busy schedules" of the other band members.

[citation needed] Shortly after leaving Underoath, Gillespie announced that he was working on a worship-based solo project.

In an interview with CBN.com, Gillespie recounted the experience and how a trip to Africa helped shape Anthem Song.

It gave me the fuel to go and do this record and also convicted me to leave Underoath and to pursue this ministry area in my life.

[27] Gillespie produced the record, played drums and did other various session work with Goldring and Collington.

[29] Gillespie worked and toured with the Billy Graham Association's FM419; an event that helps train students to share their faith.

[citation needed] While on tour with Underoath in 2007 in Las Vegas, Nevada, Gillespie underwent emergency surgery due to an infected thumb.