Credits Go To: T-Block
The purpose of a bass line is to keep the music going. No matter what happens, always keep your bass line going. The bass line can function with or without any RH chords, but not the other way around. This is what drives your music. Without this, your music will more or less be dead. As for how many bass lines there are, there are tons of bass lines, but I am going to focus on 2 of them.
Key Eb LH/RH
1. The first bass line you should learn is the classic shouting bass line. The scale degrees you are playing are: 3, 4, #4, 5, 6, *#6/b7, 7, 1 I'll also put the fingers I use beside each note:
Eb (1) / index finger
G (3) / pinky
Ab (4) / middle finger
A (#4) / thumb
Bb (5) / middle finger
C (6) / thumb
Db (b7) / middle finger
D (7) / thumb
(repeat)
*The reason why I have a #6 or b7 is because that note maybe a #6 in one key, but a b7 in another key. Both notes sound the same, but you have to name the note correctly according to your key.
2. After you got that bass line down, you can add on the second bass line that you should learn, which will just be an add-on to the classic shouting bass line. The scale degrees you are playing are: 2, *#2/b3, 3, 4, 6, *#6/b7, 7, 1 I'll also put the fingers I use beside each note:
Eb (1) / middle finger
F (2) / thumb
Gb (b3) / middle finger
G (3) / thumb
Ab (4) / index finger
C (6) / pinky
Db (b7) / middle finger
D (7) / thumb
(repeat)
*Same thing applies to the #2/b3 note as it does to the #6/b7 note.
Other basslines:
Eb, F, Gb, G, Ab, Gb, F, E
Eb, Db, Bb, A, Ab, C, Db, D
Eb, G, Bb, A, Ab, C, Db, D
Eb, Db, C, B, Bb, C, Db, D
Eb, G, Bb, C, Db, C, Bb, G
Eb, G, Bb, C, Eb, C, Bb, G
Once you learn a bass line in one key, then you should learn it in every other key. Fingering is up to you, however you feel comfortable playing them. Every key is different, so it takes much practice and patience.