tunefully

from WordNet (r) 3.0 (2006)

tunefully
    adv 1: in a melodious manner; "she sang melodiously" [syn:
           {melodiously}, {tunefully}] [ant: {unmelodiously}]

from The Collaborative International Dictionary of English v.0.48

Tuneful \Tune"ful\ (-f[.u]l), a.
   Harmonious; melodious; musical; as, tuneful notes. " Tuneful
   birds." --Milton. -- {Tune"ful*ly}, adv. -- {Tune"ful*ness},
   n.
   [1913 Webster]