you don't *have* to... i mean you can just blatantly rip off the guitarists you like (actually i'd advise doing that whether you learn modes or not :lol: "talent borrows; genius steals" and all that).
and i mean depending on what type of music you're playing or what key you're in, you might rarely ever need modes.
i think it's also worth pointing out that the major and (natural) minor scale technically are modes.
but i mean it's not that hard to learn modes.
play the major scale from E to E. that's ionian.
then play the same notes, but instead of starting on E, move up to F# and play through to F# again. that's dorian.
keep moving up one note at a time in this way and you'll go through (if i remember correctly :lol: ) phrygian, lydian, mixolydian, aeolian (natural minor) and locrian.
you can do the same thing with the harmonic minor scale. phrygian dominant is pretty cool in it (can't remember which mode it is, i could work it out but i cba, but it has a flat 2nd, sharp 4th- malmsteen uses it a lot).
but that's really only how to work them out- you should treat them as separate scales with their own sound. phrygian sounds spanish (or br00tal with distortion), lydian sounds dreamy, etc.
of course, in my own playing it's minor pentatonic or blues like 99.9% of the time :haha
I still can't work out wtf they are. For example C major and D dorian contain the same notes, so there is no difference from what I can tell. Still looking for a simple explanation and believe me I have searched. They would have to add to your toolbox if you work them out, if you do let me in on the secret ;)
you start and end on a different note, so they sound different.
"home base", for want of a better term, is a different place. the place where the music wants to resolve itself to is different. and the intervals (at least some of them) are different, which makes it sound different.
I mean teh natural minor and the major scale contain the same notes, but they sound very different. exact same idea.