1) Harmonious 2) Harmonious in sound 3) Symphonic 1) Harmonious 
• (a.) Symphonic. • (a.) Agreeing in sound; accordant; harmonious.
Sym·pho'ni·ous adjective [ From Symphony .] 1. Agreeing in sound; accordant; harmonious. « Followed with acclamation and the sound Symphonious of ten thousand harps.» Milton. 2. (Mus.) Symphonic. 
symphonious 1. Being in a state of accord; in harmonious agreement or accord.2. Harmonious in sound; as in 'the symphonic hum of a million insects' or 'symphonious of ten thousand harps'.
harmonious; in harmonious agreement or accord.