Tomas Henry Gaynor (born 21 February 1991),[1] known professionally as Allday, is an Australian rapper, singer and songwriter from Adelaide.

Following his works becoming increasingly popular, he moved to Melbourne, to pursue a serious career before later relocating to Los Angeles in February 2017.

[6][7] Gaynor played in a short-lived punk band in high school, which generated his interest in music.

The name "Allday" came about from a supermarket trip after Gaynor had smoked marijuana where he took a long time to choose a Tiny Teddy flavour.

[2] In September 2011, Allday released his free for download debut mixtape Noue Yesue (pronounced "no-way yes-way").

[13] A Skateboard Soirée received nationwide airplay on Triple J and earned him and producer C1 "Unearthed Artist of the Week" honours.

[14] In April 2013, Allday released his debut EP, Loners Are Cool, which peaked at number 18 on the ARIA Charts.

Allday said "This is a mixtape I made really quick because my album is taking forever and I wanted to put some new songs out."

On 23 June 2016—after a delay from his new label, Wind Up Records—Allday released "Monster Truck", which was produced by Cam Bluff, one of his frequent collaborators.

He later released the single "Send Nudes" on 24 August 2016 which hit the top ten on the iTunes hip-hop charts.

In March 2017, Allday announced his second studio album, titled Speeding, and released a third single "In Motion", with fellow Australian producer Japanese Wallpaper.

[25] Gaynor returned to Melbourne in 2019 to renew his visa, but stayed after meeting his girlfriend and due to the COVID-19 pandemic.