So I'm spending some time studying Modes. I've neglected it because it always seemed confusing to me. I know how modes are constructed, and I'm trying to figure out how to create bass lines by using them and breaking away from the same pentatonic stuff I've been using. I've been doing some reading here and watching some Youtube videos. So far my understanding is this. (Correct me if I'm wrong) For Major Chords, use any Major Mode. For Minor Chords, use any Minor Mode. I was jamming along to a backing track in the key of B. And the progression was B7, E7, F#7. Very simple stuff and the description of the track said all 3 were using the Mixolydian mode. Okay, a Major mode, no problem. I played around with that for a bit and started to come up with some interesting stuff. Here's where I got a bit confused though. I thought I could mix it up and use a different Major mode. I tried the Lydian, and that sharp 4th did not fit at all with the track. So I tried another track. This one was in the Key of E minor. The progression was Em, D, Am, C, D. The description said E aeollan scale over the whole track. So I started with the aeollan on the Em, but when I hit the D, it sounded a bit off moving around that mode using the flat 3rd. I tried playing the Ionian mode in place on the D chord, and it sounded fine when I hit that 3rd. But this was a Major mode over the key of E minor. So now I don't know what to think... So maybe it's not true that any Major Chord can be played with any Major Mode, and vice versa for Minor? Or is it possible that it doesn't matter what key the song is it, but more what chord is being played? I'm just all kinds of confused now. Sorry if this post seems all over the place. Here's the two tracks I was using.