Musical improvisation is an immediate musical composition and is often done within the pre-existing chord progression.
Here is the chord progression in the track:
| Em7 | Am | D | Em |
Step 1: Consider what scale can be used in the chord progression, for example, in the key of E minor, use either E natural minor scale or E pentatonic scale is best fit to the chord progression because both scales harmonize to the chord tone.
Step 2: choose the position of the scale and choose the notes limited to 5-6 notes within an octave.
Step 3: Notice the chord tone notes have to emphasis.
For example, emphasis the E note and D note in Em7 chord, A note for A minor chord, D note for D major chord, E note for Em chord.
Step 4: Restrict the rhythms have to improvise, improvise the guitar solo making of the half, quarter, and eighth notes.
Step 5: Play with feeling, thinking of just like singing a vocal line.