Hendrix had been recording with Cox since April .
Hendrix had jamming with Miles since September , and the trio wrote and rehearsed material which they performed at a series of four shows over two nights on December 31 and January 1 , at the Fillmore East .
Hendrix had been recording with Cox since April and jamming with Miles since September , and the trio wrote and rehearsed material which they performed at a series of four shows over two nights on December 31 and January 1 , at the Fillmore East .