intertone
/ˈɪntərtoʊn/Definitions
1. noun
A tone or note that is interposed between two others, especially in music; an interlude or connecting passage in music.
“The composer used an intertone to transition between the different sections of the symphony.”
2. verb
To play a note or notes between others, especially in music.
“The violinist intertoned a gentle melody between the loud chords.”