Originally Posted by: Dark_RhodezIf I'm playing in let's say lydian which chords should i use to that, the minor and major scales works perfect with minor and major chord, so I was just wondering if lydian work togheter with something.

The lydian scale is a mode of the major scale, so the lydian scale will work with any chords from the key relative to which mode you use. If you understand modes then this is easy. Take F lydian, which is the C major scale starting with the fourth note. C major: C D E (F G A B C D E F). In parenthesis is the Lydian scale. Since F lydian is relative to C major, you can use any chords from the key of C major.

and also, if i know a chord let´s say Amaj7 wich scale should i play to that ?

The Equation to figuring what scale will work with a chord is to look at what notes are in the chord. Your example, Amaj7 contains the notes A C# E G#. So any scale that contains those notes will work over that chord. It's that simple, and it works for any chord, and thus any scale. You can even do this in reverse, and you would answer your first question in a different way.