Georgie Leonard's 1971 recording of  Ernie the Nark.  It is unknown whether it is Jaco on bass.  Georgie Leonard claims to have met Jaco while recording his album One Man Band at Miami's Criteria Studios, and inviting him to play bass on the song Ernie the Nark.  Although Jaco was hanging around Criteria at the time, and other parts of the story sound plausible, the bass part in no way resembles Jaco's playing. 

1. Ernie the Nark 2:20
   

Jaco's 1974 demos, recorded at Criteria Studios.  The demos were recorded in two sessions, the first featuring Bobby Economou on drums and Alex Darqui on piano, and the second adding Othello Mollineaux and Don Alias to that trio. The two sessions were condensed down to a 6 cut acetate, which consisted of the following tracks; Side 1, Balloon Song (aka Twelve Tone Tune) and Pans #1(Opus Pocus). Side 2 was Kuru, Continuum, Pans #2(Opus Pocus), and Time Lapse.  The version I have has Havona becoming Continuum, not as a separate cut.  Time Lapse sounds similar to the tune Vampira, from the album Pastorius/Metheny/Ditmus/Bley, which was recorded the same year. 

1. Havona 5:29

2. Continuum 4:50

3. Time Lapse 5:17

4. Balloon Song (aka Twelve Tone Tune) 13:01 
   
The following tracks are presumably from the fall, 1975 sessions, that produced the album Jaco Pastorius.  On Forgotten Love Jaco plays unaccompanied piano, and Portrait of Tracy is of course a bass solo.  On Havona Don Alias plays percussion, Lenny White is on drums, and Herbie Hancock plays piano.  Personnel on cuts 1 and 3 is unknown.

1. Microcosm 3:09

2. Portrait of Tracy 2:45

3. Liberty City 2:18

4. Forgotten Love 2:04

5. Havona 7:08
   

Jaco played briefly on the 1976 horror film Bloodstalkers.  The film’s final credits say “Music composed and conducted by Stan Webb”, and lists Peter Graves as the “Musical Coordinator”.  Peter enlisted Jaco to play on a brief interlude, accompanied by Bobby Economou on drums, Alex Darqui on piano, and Don Alias on percussion.  These recording were probably made in 1974, around the time of the Criteria Studio demos.
   
Jaco and Wayne Shorter may have played on the soundtrack of the French thriller Le Choc, which was released in 1982 (although the soundtrack may have been recorded earlier).  Listening to the soundtrack album is inconclusive as to whether it could be them.
   

In his biography The Extraordinary and Tragic Life of Jaco Pastorius, Bill Milkowski details Jaco working on these four tracks on September 11, 1986, while he was released from Bellevue on a two hour pass.  He spent that time at a small studio in Manhattan, putting a final mix on four cuts from his unreleased album Holiday for Pans.  These cuts clearly show that Jaco's intent was to have no  bass on them, in contrast to the many bootleg versions that have since been released.

1. Holiday for Pans 3:08

2. Elegant People 7:25

3. Mysterious Mountain 1:28

4. Good Morning Annya 5:48
   

These tracks are from the sessions that produced the 1988 release entitled Natural.  The original release was on Japanese label DIW, but was produced for Pulque Productions.  The artwork on this release says Natural Version Completa, and is on Pulque Records.  I dont know if this has ever been released, or if it will be  some day.  The tracks are all different than the original release.

1. Leap Frog 6:58

2. Phlegeton 11:40

3. Jaco's Bass Line 3:58

4. The Foreigner 9:55

5. Jaco's Piano Solo 18:00

7. Give Me Some 8:52