The very first mistake is having unrealistic expectations. You should make sure that you never have unrealistic expectations when you are listening to instrumental music. Instrumental music is music without any lyrics. You need to go along with the notes and the sounds and feel the music in your soul. Another mistake that a lot of people make is just learning the songs. A lot of new people only learn the songs; they don't connect with music like people used to before. Another gigantic mistake that people make is not giving honest critique. A musician deserves honest critique think so that he can fix his mistakes.