This backing track helps you study the Two Five One progression, (or II -V- I) in minor keys. One of the most important progressions, and indispensable for Jazz.
The Video plays the 2-5-1 (in twelve different keys) descending one semitone, that is, chromatically descending each time we change key.
In the picture, you can see the minor progressions in all keys, for different instrument tuning. Instruments in E Flat, instruments in C, instruments in B flat.
2-5-1 minor progression
Backing Track with the full II-V-I minor progression in all keys
If you want to practice each minor two five one individually, here you have the backing tracks for all keys (standard tuning, check the picture to see the equivalent):