<Tr> <Th_colspan="2"> Music video </Th> </Tr> <Tr> <Td_colspan="2"> "Wish I Knew You" on YouTube </Td> </Tr> <P> "Wish I Knew You" is a song by American rock band The Revivalists . The song was written by the band and was produced by Ben Ellman . The song peaked at number 1 on the Billboard Adult Alternative Songs chart, becoming the band's first chart - topper on the chart . The song also found success on a number of other rock radio formats, as well as adult contemporary stations . This song also set the record in May 2017 for the most plays (spins) ever recorded during a week's time (3,488 across the panel) for any track on Alternative / Modern Rock radio since the inception of Mediabase tracking systems in 1988 . </P> <P> The music video was released on February 23, 2016 . </P>

Who sings the song wish i knew you when i was young