Elton John rocked the Sunset Strip Saturday with a free outdoor concert that featured a performance by Lady Gaga.

WEST HOLLYWOOD, CA – FEBRUARY 27: Elton John performs live on the Sunset Strip, on February 27, 2016, as a thank you to the City of West Hollywood for their support of the Elton John AIDS Foundation.

The superstar singer and piano player, showing West Hollywood his appreciation for its support of the Elton John AIDS Foundation, performed a selection of his huge catalog of hits for those in and around the parking lot of the former Tower Records.

One of the biggest highlights came when Lady Gaga joined John and his five band members near the end of the 72-minute show for a rendition of Don’t Let the Sun Go Down on Me. On stage, John personally thanked the city for helping with the foundation’s work and with his annual Academy Awards viewing party.

Lady Gaga joins Elton John and his band at a free outdoor concert Saturday on the Sunset Strip.

As thousands looked on from the Tower Records parking lot, Sunset Boulevard, a side street and the roofs of nearby buildings, John said it was fitting to have the performance at the site of the former records store, one of his favorite places.

The crowd for Elton John’s free outdoor concert spilled onto Sunset Boulevard Saturday.

The band closed with a rousing Saturday Night’s Alright for Fighting, with band members joining John at the piano and the singer jumping up to implore the crowd to sing the chorus.

Lady Gaga