Hi,
I started by extracting a theme from a large quantity of notes i played from feel. I figured out the theme was roughly at 102bpm and Cubase allowed me to figure this bpm out without changing the themes tempo.
With that extracted piece I started layering on additional piano, string and even flute. But when i isolated the piano i noticed it needed a stronger base line. So I free styled some piano chords. This made me remove the strings and flute and then I added drum and free styled a piano melody. The drums helped me to adjust the piano melody notes to better fit the 102 bpm.
music sketch
Happy Sketching!
Nate