sorry but I learnt this in a music school and using paid materials I don't know where you can find this well explained. I've done a quick look and i've found t

sorry but I learnt this in a music school and using paid materials I don't know where you can find this well explained. I've done a quick look and i've found this videos that I think are ok as starting point: https://www.youtube.com/watch?v=aDD4q9xd8Ac https://www.youtube.com/watch?v=aDD4q9xd8Ac https://www.youtube.com/watch?v=ImFFi_QBnUs https://www.youtube.com/watch?v=ImFFi_QBnUs https://www.youtube.com/watch?v=mWpXy57-mvc https://www.youtube.com/watch?v=mWpXy57-mvc Hope it helps