Answer: abiebaby

AnswerCrossword Clue
ABIEBABY"Hair" song with the lyrics "four score and seven years ago"
ABIEBABYSong in "Hair" that mentions Lincoln
ABIEBABY"Hair" song containing Gettysburg Address phrases
ABIEBABYSong that quotes the Gettysburg Address in "Hair"
ABIEBABY"Hair" song with birthday wishes to a president