Q: How do you mix maj/min chords with extended chords and have it sound fitting? I feel like I can only sequence maj/min chords with other maj/min chords in a progression. Mixing extended maj/min chords with plain old maj/min chords sounds too jarring, but *you* do it in a way that sounds like it fits. It's like plain major chords sound really bright and upbeat, but adding any extended chords after one clashes since most extended chords have a deeper feeling to them.
A: it's really quite simple. songs. listen to songs, make your own songs, ..... a general rule, if it's not a song, it didn't happen