This practice is in A Harmonic minor scale whose notes are:
A-B-C-D-E-F-G#-A
The A Harmonic Minor scale can be obtained by flattening the 3rd and 6th note of the A Ionian Mode (the major scale) or just sharpening the 6th note of the A Aeolian Mode (Natural Minor)
The Harmonic minor scale is very common in Melodic Death Metal, Technical Melodic Metal and in classical pieces like that of Vivaldi.
The A Harmonic Minor Scale (4 octaves)
e|-------------------------------------8-10-12-13-16-17---------|
B|-----------------------------9-10-12--------------------------|
G|----------------------7-9-10----------------------------------|
D|-------------6-7-9-10-----------------------------------------|
A|-------5-7-8--------------------------------------------------|
E|-5-7-8--------------------------------------------------------|
You can practice this with some pattern.
Now a cool sounding lick follows, its sounds kinda neo-classical with a nice overdrive.
Part I:
Part I goes with the A Harmonic scale on the high e string. Use a metronome to practice this part and don't proceed to the next part until you can play with a normal speed and you hand doesn't hurt.
D B C
e|-10-13-12-13-10-13-12-13-7-10-8-10-7-10-8-10-8-12-10-12-8-12-10-12|
B|------------------------------------------------------------------|
G|------------------------------------------------------------------|
D|------------------------------------------------------------------|
A|------------------------------------------------------------------|
E|------------------------------------------------------------------|
A B G# A
e|5-8-7-8-5-8-7-8-7-10-8-10-7-10-8-10-4-7-5-7-4-7-5-7-5-8-7-8-5-8-7-8|
B|-------------------------------------------------------------------|
G|-------------------------------------------------------------------|
D|-------------------------------------------------------------------|
A|-------------------------------------------------------------------|
E|-------------------------------------------------------------------|
e|5-8-7-8-5-8-7-8-|
B|----------------|
G|----------------|
D|----------------|
A|----------------|
E|----------------|
Part II:
Part II follows Part I but the change is that insted of the base note changes to E (the open note) the second time we play it.
G# E A E B E C E
e|-4-7-5-7-0-7-5-7-5-8-7-8-0-8-7-8-7-10-8-10-0-10-8-10-8-12-10-12-0-12-10-12|
B|--------------------------------------------------------------------------|
G|--------------------------------------------------------------------------|
D|--------------------------------------------------------------------------|
A|--------------------------------------------------------------------------|
E|--------------------------------------------------------------------------|
Part III:
Follows part II ofcourse, but this time we descent the A Harmonic minor but not follwing the exact order of notes which makes it sound very interesting.
e|-10-13-12-13--------------------------------------------------|
B|-------------9-10-12-10---------------------------------------|
G|------------------------7-10-9-10-----------------------------|
D|----------------------------------6-9-7-9---------------------|
A|------------------------------------------5-8-7-8--7-6-7------|
E|---------------------------------------------------5-4-5------|
Now join Parts I,II, and III.
Hear the good sound. With lots of practice, you can build a lot of speed. And this practice speed our left and right hand together, so enjoy it.