"Key to the highway" is known to have been performed at least twice in Bruce Springsteen's early years. Very little is known about shows from this early period, and therefore, the song must have been played on some more dates.
1971-10-23 - KELLER HALL GYMNASIUM, UNIVERSITY OF RICHMOND, RICHMOND, VA (The Bruce Springsteen Band)
1971-12-03 - STUDENT PRINCE, ASBURY PARK, NJ (The Bruce Springsteen Band)
2015-08-01 - WONDER BAR, ASBURY PARK, NJ (Timepiece)
was performed off-tour during a private party for friends of Bruce Springsteen and Patti Scialfa. The couple performed a seven-song set with Timepiece, a local band of which Patti Scialfa's brother Michael is a member. Springsteen played guitar on key to the highway.