The Speed of Sound is the second extended play by Australian boy band In Stereo (Jakob Delgado, Ethan Karpathy and Chris Lanzon).

In 2015, In Stereo auditioned for season 7 of The X Factor Australia and made it to the top 12.

The group were eliminated in week 4, coming in eighth place.

[citation needed] Following the elimination, the trio signed a record deal with Warner Music Australia and released their first extended play She's Rock n Roll on 1 April 2016, which peaked at number 11 on the ARIA Chart.

The group supported the EP with an Australian tour throughout July 2016.