"Thank You" is a song written by Robert Plant and Jimmy Page that was released by English rock band Led Zeppelin on their 1969 album Led Zeppelin II. It is a slow ballad and signaled a deeper involvement in songwriting by Plant, being the first Led Zeppelin song that he wrote all the lyrics for. The first lines of Plant's composition heavily resemble those in the Jimi Hendrix song "If 6 Was 9".
The song features some delicate organ playing by John Paul Jones, and ends with the organ fading into near-silence before coming back about 10 seconds later. This has created a problem for radio stations wishing to play to track, which must decide whether to accept the "dead air" or cut it off. Some stations typically run edited versions with the silence eliminated, whilst others play "Thank You" together with "The Lemon Song", because there's no pause between them on the album.
"Thank You" was a popular song when played live at Led Zeppelin concerts, and became something of a showcase for Jones' keyboard work. An example of this can be heard on the Led Zeppelin BBC Sessions album, which captures a version performed at the Paris Theater in London in 1971. However, the song was eventually dropped from the band's standard live setlist following the 1973 Houses of the Holy concert tour, when it was only occasionally used as an encore.
In 1992 Robert Plant sang part of "Thank You" before merging in to "Crazy Little Thing Called Love" by Queen at the The Freddie Mercury Tribute Concert.
Page and Plant revived the song in 1994 on their Unledded tour. They played a somewhat mellower arrangement for most of their shows from 1995 through 1998 as either an opening number or an encore.