When I'm playing piano as an accompaniment to singing, I pull up chord charts for the song and wing it. But I can't seem to figure out how to make the piano sound interesting.
For example, the song I'm playing at the moment is in 4/4 and has the chords: Cmaj7 F#7#11 Fmaj7 F/G F/Ab G7sus. The first three chords take a measure each, and the last three chords all together take up one measure. At the moment, I am just playing them vanilla. So I play the Cmaj7 and hold it for the full measure. Then I play the next chord and hold for a full measure, etc.
But when I hear people playing accompaniments, they play lots of notes in between the chords, with cool syncopations. And sometimes the notes they play aren't belonging to the chord, so they sound quite interesting. Are there some go-to rules I can use for making it sound better? Things like "a sixteenth note before playing the next chord, play the root of the current chord"? Improvisation and experimentation haven't worked for me, so I need help!