All 4 Uses

harmonious
in
Breaking Dawn, by Meyer
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So many different kinds of love, harmonious in this one moment.†
Book 1
Seth barked a low chortle in harmony with Edward; he came a little closer while Leah retreated several paces.†
Book 3 *
The hideous fire...After almost an hour—the others were still deeply absorbed in their discussion, Seth and Jacob snoring in harmony on the couch—Renesmee's memory stories began to slow.†
Book 3
It was furnished in eclectic pieces, not one of them matching another, but harmonious just the same.†
Book 3 *

Definitions:

(1) (harmonious as in: live together harmoniously)
co-existing in a friendly and peaceful way; or having components that are combined in a pleasing way
(2) (harmonious as in: soothing, harmonious music)
of music: pleasing (through the combination of different notes)

When speaking of music, do not confuse harmonious (pleasing sound) with harmony (the structure of the music with respect to the composition and progression of chords regardless of how pleasing it may or may not be).
(3) (meaning too rare to warrant focus)