All 3 Uses

accompany
in
This Lullaby, by Sarah Dessen
(Edited)

He sighed, put his hands on his hips, and looked up at the sky, then grabbed the door handle again and started to pull himself up just as it moved again, this time accompanied by someone beeping the horn.
Chpt 1

accompanied = joined (at the same time)
The band segued cleanly into "Shout," accompanied by a whoop from someone behind me.
Chpt 4

accompanied = joined at the same time
Living off beans, however, is reminiscent of a more slang culture, realistic, and a lower class, which is indicative of both the speaker in the song and the music that accompanies it.
Chpt 8 *

accompanies = is provided with (to make it better)

Definitions:

(1) (accompany as in: accompany on the journey)
to travel along with
(2) (accompany as in: the accompanying chart)
to be present with at the same time and/or location -- sometimes provided to make something more complete or better
(3) (accompany as in: accompanied her in the performance)
to perform with
(4) (meaning too rare to warrant focus)