Watch the Bird 'n' Some Beast: Lead 1 online guitar lesson by Andy Aledort from Jam Night Vol. 1
Soloing over relative major/relative minor chord progressions is always fun and challenging, as one can stick with the same bunch of notes while alluding to each chord clearly. The first chord is E, so I play lines based on E major pentatonic (E F# G# B C#); this series of notes also comprised C# minor pentatonic, which works perfectly over C#m (or C#m7). These pitches also work well over A because most of the notes of A major pentatonic (A B C# E F#) are included in E major pentatonic.