in harmony

in harmony (with someone or something)

1. In music, forming a pleasing combination. It can also, more specifically, refer to performing a song's harmony notes as someone else provides the melody. OK, stop, you guys aren't in harmony, and the song doesn't sound right. I need the sopranos to be in harmony with the altos here.
2. In agreement with someone or something; matching someone or something. Those two always seem to be in harmony about everything—I guess that's why they're best friends. The suspect's statement is not in harmony with the information witnesses have given us.
See also: harmony, someone
Farlex Dictionary of Idioms.

*in harmony

 (with someone or something)
1. Lit. in musical concord with someone or something. (*Typically: be ~; get ~.) This part is in harmony with the tenor's solo. The tenor part is not in harmony with the accompaniment.
2. Fig. agreeable or compatible with someone or something. (*Typically: be ~; get ~.) This is in complete harmony with our earlier discussions. Fred's position is quite clear. What you have said is not in harmony with Fred.
See also: harmony
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • harmony
  • in harmony (with someone or something)
  • harmonize
  • harmonize with
  • harmonize with (someone or something)
  • in agreement
  • in agreement (with someone or something)
  • at one with (someone or something)
  • music to (one's) ears
  • music to ears
References in classic literature
But on the following Friday he was waited upon by the Pillars of the Church, who informed him that in order to be in harmony with the New Theology and get full advantage of modern methods of Gospel interpretation they had deemed it advisable to make a change.
Fantastic Fables
But for the most part, the bureau's pre-Levi counterterrorist efforts were conducted within the law and in harmony with federalism.
Watergate & the weather underground: former FBI second-in-command Mark Felt, aka Watergate's "Deep Throat," was an opponent of both presidential corruption and domestic terrorism
First, the company's franchising development initiatives must be in harmony with its business values, credos and tenets.
Secondly, the company and its employees must be in harmony by moving in the same direction and employees must wholeheartedly support it.
Finally, the company must be in harmony with the communities with whom it seeks to do business.
All you need is faith the size of a mustard seed: The franchise community can attract more minority and women entrepreneurs by using faith--focus, anticipation, initiative, time and harmony. (Minorities And Emerging Markets)