This is a big band setting of the famous JJ Johnson & Kai Winding duet from the album "The Great Kai & JJ". The two trombone solo parts are meticulously transcribed, including the solos (changes also provided on parts during solo sections. 3 other trombone parts, but leaving one out will not hurt your performance. 
 
Please check out the score playback here: https://youtu.be/tWxIGDeLPDc
 
Please check out this band performing the chart: https://youtu.be/KAFv4pDP8lU