Just some examples on the 2-5-1 (to be ‘proper’ I should write II-V-I ) progression in C major, using only notes from the major scale. Remember the harmonic rhythm concept: strong notes on strong beats. I definitely advice recording yourself and criticize your playing in a positive way. There is no point in saying ‘that was horrible’. Istead say ‘ why does that not sound as it should?’. Am I playing too many wrong notes? Is my timing off? Are my melodies not strong enough? Try again and fix what you think is wrong.
Again you can find the 2-5-1 all keys Printable PDF >Here<