Use the E Mixolydian notes as your main palette over this Country backing track. Keep phrases short and listen for how each note feels against the chord that is currently playing.
A 3-chord progression gives this Country backing track clear movement while still leaving plenty of space for lead guitar. Listen for how each chord changes the feel of the same E Mixolydian notes.
This 3-chord progression moves through E7, D, and A. As each chord arrives, aim your phrase endings at notes from that chord. Those target tones are the clearest places to land, and the rest of the scale helps you connect one chord tone to the next.
Start simply: play two or three notes, leave space, then answer with another phrase. Add slides, hammer-ons, pull-offs, bends, or vibrato after the target-tone movement feels clear.