King of the Delta Blues Singers is a compilation of recordings made by blues musician Robert Johnson in 1936 and 1937. It was released by Columbia Records in 1961 and has since become the most influential classic album of the blues genre. It was ranked 374 on the 500 Greatest Albums list for 2020 by Rolling Stones.
Lydian is most likely the typeface used for the album cover. The album title is set in Lydian Bold Italic and the singer's name is set in Lydian Bold. You can view more details about Lydian typeface here.