melodious

Etymology

From Old French melodios; equivalent to melody + -ous.

adj

1. Having a pleasant melody or sound; tuneful.
   A lovely crisp exhaust: a feeling of almost unlimited power combined with complete freedom of running: and, to crown it all, a most melodious and wholly American chime whistle—these were my immediate impressions as we stormed rapidly out of Göttingen, intent on winning back some of the lost time. 1960 October, P. Ransome-Wallis, “Modern motive power of the German Federal Railway: Part Two”, in Trains Illustrated, page 611
   Patinkin’s melodious voice is a natural fit for animation, and he breathes just the right type of upper-crust life into Hugh in 22 short minutes. October 13, 2013, Erik Adams, “TV: Review: THE SIMPSONS (CLASSIC): “Lisa’s Wedding” (season six, episode 19; originally aired 3/19/1995)”, in The Onion AV Club