melodiously

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Melodious \Me*lo"di*ous\, a. [Cf. F. m['e]lodieux. See
   {Melody}.]
   Containing, or producing, melody; musical; agreeable to the
   ear by a sweet succession of sounds; as, a melodious voice.
   "A melodious voice." "A melodious undertone." --Longfellow.
   -- {Me*lo"di*ous*ly}, adv. -- {Me*lo"di*ous*ness}, n.
   [1913 Webster]