Accompaniment is the part of the music you play to support, or play along with, a singer or lead instrument, usually with the left hand. Ideally, it should create a musical platform, as a structure to carry the singer or lead instrument. It provides the chords, style, tempo and timbre yet allows the singer or lead instrument to shine out above or through it. There are several ways of providing an accompaniment using a digital piano.
Some Suzuki digital pianos allow you to produce an accompaniment with just one finger. The TSI-1ei is an example of an instrument with this capability. Using just one finger to make choices on the LCD TouchScreen Control Panel, you can access many auto accompaniments, including 100 rhythm styles arranged by professional musicians. Having chosen an accompaniment, you can select a voice for the lead instrument and play along.
Another way of playing an accompaniment using just one finger is by playing the chord root notes with the left hand. The root note of a chord is the note on which the chord is built. The root note of the chord of C, for example, is the C note. If you play the chord root note on every major beat, changing the note as the chords change, you will always be playing in key.
You can also play chords with the left hand to provide an accompaniment. On many musical scores the chords are marked. The G major chord, for example, consists of the notes G, B and D. Hold these down with your left hand while playing the melody. Alternatively, play B, D and G or D, G and B. These are called inversions. Choose the inversion that sounds best. You can also vamp, which means playing the chords in a repeated rhythm.
If you can span an octave with your left hand, or 12 semitones, you can play an accompaniment that includes the root note and its equivalent note an octave higher or an octave lower. This can create a very powerful bass sound to the music. Alternatively, you can listen to the music you are trying to play, pick out the accompaniment by ear, learn it and play that. You can, of course, learn to read music too. Most pieces of music have an accompaniment all ready for you to play.