They can also be used for playing scales over, or chord changing if you want to. They all have the same bass rhythm so you can paste any together in whatever combinations you like.
The 2 chord progressions:
A and E;
A and a lower E;
C and G;
G and D (or A).
Deep Pad Composition is a more complicated progression but with the same bass rhythm:
2 bars bass intro/ E x4/D x4/A x2/Em x2/D x2/Em x2/D x2// repeat x 3.
The G chord + Bass + lead is one chord throughout, but with some lead added that you could copy if you want/need an easy intro to playing over chords - like me.