Led Zeppelin did not release any singles in the United Kingdom until 1997 , when " Whole Lotta Love " was released 28 years after it was written . There were several pressings made of " Trampled Under Foot " as a single in 1975 in time for the band 's Earl 's Court concerts , but they were all shelved before being released , and are today highly sought-after collectors items
Earl 's Court concerts
Earls Court 1975
Trampled Under Foot