“Sarah” was a single first released by Dublin Ireland’s Thin Lizzy in 1979; it reached #24 on the British pop charts and #26 in Ireland.
The Academic, a band from just west of Dublin, met while attending the same secondary school during the 2010s. AllMusic reports that the group ” … rode a series of punchy, melodic singles to national success when their 2018 debut album topped the Irish charts. They soon netted a deal and followed up with a couple of dreamy singles … “
“Sarah” was apparently a live one-off for the band; the track wasn’t included on either of its studio releases. This performance was live on Today FM, an Irish radio station. After starting in A major, 1:48 brings an instrumental bridge, followed by a shift to Bb major at 2:08.