Sea Level is the name of a group that mixed jazz, blues and rock that existed between 1976 and 1981.
These are photos from concerts where Sea level played, so they may be of other bands that played the concert as well.
The Outlaws / Sea level / Mama's Pride May 6, 1977 Philadelphia, Pennsylvania, United States Uploaded by Zimtrim
Lynyrd Skynyrd / Sea level Apr 22, 1977 Johnson City, Tennessee, United States Uploaded by Zimtrim
Electric Light Orchestra / Sea level / Elliot Murphy Mar 27, 1977 Lexington, Kentucky, United States Uploaded by Zimtrim
The Outlaws / Sea level Feb 11, 1977 Passaic, New Jersey, United States Uploaded by Zimtrim