8 and 16 bar blues can also sometimes be found ... time for the singer to make up the last line. Some notes used in blues music may be flattened by a semitone. These are normally the third ...

“Don’t Be Cruel” by Elvis Presley presents a 12-bar blues pattern with an alteration of the final phrase (II–V–I rather than V–IV–I) in the strophes (the song is in AABA form). “Surfin’ USA” by the ...