Swan co-founded the Sacramento based post-hardcore band Farewell Unknown, releasing the album The 40 Day Fake Out in 2004, before disbanding.

In 2013, together with members of Stolas and A Lot Like Birds, he formed the post-hardcore supergroup Sianvar, releasing their self-titled debut EP in 2014 followed by their debut studio album, Stay Lost (2016), each on Swan's record label Blue Swan Records.

After Sianvar disbanded in 2018, Swan joined the progressive rock band Royal Coda, participating on their second and third albums Compassion (2019) and To Only A Few At First (2022).

[5] He became interested in pursuing a music career after seeing Green Day at Fillmore West in San Francisco at the age of 12, in December 1997.

In 2008, vocalist Jon Mess and bass guitarist Eric Lodge left the band.

Swan pursued both lead and rhythm guitar along with unclean vocals and Lodge was replaced by Jason Ellis.

Happiness was released as the band's third studio album on June 9, 2009, and was led by the singles "Don't Tell Dave" and "NASA."

[13] On February 21, 2020, the group announced their ninth studio album, Afterburner, with a scheduled released date of April 24, 2020.

[16] The live album was accompanied with a concert streaming event where the group performed a fan voted setlist on the Tower Bridge in Sacramento, California, which was broadcast on December 19.

[19] Sianvar is a post-hardcore supergroup founded by Will Swan with Hail the Sun's Donovan Melero (vocals), Stolas' Sergio Medina (guitar), A Lot Like Birds' Joseph Arrington (drums, percussion), and A Lot Like Birds' Michael Franzino (bass guitar).

[22] On June 5, 2019, Swan was announced to be a guitarist in the American post-hardcore band Royal Coda, who are signed to his independent record label Blue Swan Records and consists of lead vocalist Kurt Travis, former Stolas guitarist Sergio Medina, and former A Lot Like Birds drummer Joe Arrington.

[26] On July 6, 2022, the band announced their third studio album, To Only A Few At First, and released two songs, "We Slowly Lose Hope For Things To Come" and "Screen Time Overload", the former of which had a music video premiere on Blue Swan Records channel on YouTube.

The label is prominently known for signing the rock bands Hail the Sun, Icarus the Owl, Stolas and Wolf & Bear.