Answer: cdef

AnswerCrossword Clue
CDEFAlphabetic quartet
CDEFAlphabetic run
CDEFAlphabet string
CDEFAB followers
CDEFKeyboard sequence
CDEFAlphabetical run
CDEFAlphabet run
CDEFB's tail?
CDEFCertain scale start
CDEFPreceders of G
CDEFScale start
CDEFAlphabetical quartet
CDEFB-G link
CDEFB train
CDEFAlphabetic sequence
CDEFB-G connectors
CDEFStart of a scale with no flats or sharps
CDEFAlphabet quartet
CDEFB-G connection
CDEFHalf of a major scale
CDEFStart of a basic scale
CDEFScale starter
CDEFScale opening