1) Agreeable to the ear 2) Euphonous 3) Golden 4) Having a pleasant sound 5) Not harsh or strident 6) Pleasant in sound 7) Pleasing in sound 8) Silvern 9) Silvery Found on https://www.crosswordclues.com/clue/euphonious
Eu·pho'ni·ous adjective Pleasing or sweet in sound; euphonic; smooth-sounding. Hallam. -- Eu*pho'ni*ous*ly , adverb Found on http://www.encyclo.co.uk/webster/E/73