Accompaniment - instrumental accompaniment of a melody, vocal or instrumental. Accompaniment can be performed by a group of instruments (all kinds of ensembles) or one instrument (piano, guitar). It is important that in any accompaniment it is possible to extract sounds of any pitch: low, medium and high. Each of these parts of the range has a specific function. If there are no notes for the piece, you can choose the accompaniment by ear by analyzing the audio recording.
Listen to the entire piece. Then select the passage (intro) and repeat. Listen to the bass, try to repeat it right away on the instrument.
Repeat the section while playing the bass until you can play it completely.
In the same way, select the rest of the fragments: lead, chorus, bridge, solo, finale. It is better to check every lead and chorus, because some songs use transport (changing the key).
Play each section in the same way, playing bass and picking up chords (booms, rhythms, and other elements). Repeat several times.