#3
It's a JAM, not something to be copied in my opinion.

It seems that he is in the key of Aminor. Here are a few Aminor scales:
Aminor Pentatonic

|---------------------------5-8|
|---------------------5-8------|
|----------------5-7-----------|
|-----------5-7----------------|
|-----5-7----------------------|
|5-8---------------------------|


Aminor Blues

|--------------------------------5-8--|
|---------------------------5-8-------|
|-------------------5-7-8-------------|
|-------------5-7---------------------|
|-----5-6-7---------------------------|
|5-8----------------------------------|


They are both basically the same with a few changes.

If you want more scales you can check out Chordbook This link is for scales.