This is the first Weather Report album to feature bass legend Jaco Pastorius on all tracks (he appeared first on Black Market, but shared the bass duties with Alphonso Johnson). On Heavy Weather, Jaco showed pretty much everything he had, from the pyrotechnics of "Teen Town", through the lyricism of "Harlequin" and "The Juggler", and finally to Jaco's own tune "Havona". This last track features (in this reviewer's opinion) one of THE outstanding bass solos on record.
As great as Jaco's contribution was on an individual level, it is matched, if not surpassed, by the ensemble playing on most if not all of the tunes. Even without the chart-topping (and perhaps rather overplayed) "Birdland", this album would stand as one of the absolute classics of 70s jazz-rock. For anybody with an interest in that genre, this is a must-have.