noun (n)

• a succession of notes forming a distinctive sequence(noun.communication)

  Synonym:
  air, line, melodic line, melodic phrase, strain, tune
  

  source: wordnet30
• the perception of pleasant arrangements of musical notes(noun.cognition)

  Synonym:
  tonal pattern
  

  source: wordnet30
• A sweet or agreeable succession of sounds.(noun)

  source: webster1913