This is, in two words, virtuoso musicianship. The ability to just pick a time signature out at random and play it is something only the Mahavishnu Orchestra and Weather Report can do well.
Mc Laughlin's woozy guitar and Cobham's lightning speed drumming are the force behind Birds Of Fire, Mahavishnu's best album. It knocks The Inner Mounting Flame and Inner Worlds for six. As I am only 14, I wasn't around when Mahavishnu were in full flight, but I can imagine the impression this record made.
If you want to try something modern in a similar vein, try "Deloused In The Comatorium" by The Mars Volta. This is an awesome record and they follow a lot of Mahavishnu's playing styles.
So, Birds Of Fire, awesome, five stars.