Matt Miller is a native of El Paso, Texas and the bassist for the Post-hardcore band, Sparta.

Matt Miller joined vocalist Jim Ward, drummer Tony Hajjar, and guitarist Paul Hinojos in Sparta a few months after its conception when original bassist Erick Sanger was let go from the group, and Miller's previous band Belknap broke up.

[2] For the band's first record, Wiretap Scars, all members contributed lyrics, and Miller was no exception.

[3] Though Sparta's frontman Ward now takes on lyrical duties by himself; Miller has expanded his role in the group, now providing back-up vocals along with guitarist Keeley Davis (Hinojos has since left the group).

Miller refers to Threes as more positive than the previous records, and describes the addition of Davis as a breath of fresh air.