Source : Webster's Revised Unabridged Dictionary (1913)

Tuneful \Tune"ful\, a.
   Harmonious; melodious; musical; as, tuneful notes. `` Tuneful
   birds.'' --Milton. -- {Tune"ful*ly}, adv. -- {Tune"ful*ness},
   n.

Source : WordNet®

tunefully
     adv : in a melodious manner; "she sang melodiously" [syn: {melodiously}]
           [ant: {unmelodiously}]