This recording has a real particular story, here is what the taper/uploader said about it:

Here is how this went. Dr. John was going back and forth between New Orleans and New York City and had a place not so far from the Lone Star Cafè so he played there on a regular basis: we had many chances to hang out with him and he always had great stories to tell; he gave me the OK to plug into the board that night at the time of the show, Dr. John s bass player was the great Wilbur Bascomb who was also working with Mick Taylor s Band and between shows I was in the dressing room with my friend Bobby when I saw Mick coming to see Wilbur. I noticed him and mentioned to my friend suggesting that maybe Mick could sit in with Dr. John. We first went to Dr. John and told him that   Mick would like to sit in for a few songs, then we said to Mick that Dr. John would let him sit in. Apparently our little plan worked well as they both agreed. Mick came up for three songs, probably not being too familiar with the New Orleans style, during the first song he seemed a little unsure of himself and after the first song I was at the soundboard calling for a blues since I knew Mick would do it better in that setting. The second song was a medium tempo blues shuffle and it was good for everyone. The final song was a pretty straight ahead blues and worked well too.

The sound is great indeed with heavy emphasis on the brass section and the performance very good as well; Disc One presents the first show with all Dr.John s trademark tunes in perfect New Orleans style starting with Iko Iko going through Right Place, Wrong Timeo Jambalaya and also a rendition of Walking On Gilded Splinters a song that Mac Rebennac wrote in the first place and recorded on the Night Tripper album. On the last number Big Chief, the famous Professor Longhair anthem there is also the first personnel introduction (the second is on the last number) which apart from DR. John on Vocals and Piano is composed of Wilbur Bascomb on Bass, Joe Carol on Guitar, Trazzi on Percussion, Lou Marini on Sax, Lew Soloff on Trumpet, Ronnie Cuber on Sax, Richard Crooks on Drums with Herman Earnest on Drums on Disc Two, Tracks 3-6 and Mick Taylor on Guitar on Disc Three Tracks 4-6. The great thing of these two concerts is that there is no duplicate and in the second one there are classics too like Mess Around, Wang Dang Doodle, Tipitina and all the songs where Mick Taylor joins the band.