Small Ensemble
Audio

This entry likely refers to a specific arrangement or a generic title rather than an individual arranger. If it were an arranger, their style would probably be celebratory and accessible, focusing on melodic clarity and a generally upbeat disposition suitable for festive occasions.
Birthday has 2 published jazz band arrangement2} available for instant PDF download at Jazz Band Library.
You can purchase Birthday sheet music arrangements at Jazz Band Library (jazzlib.com). All arrangements are available as instant PDF downloads.
The arrangements are available for big band (17+ musicians), dixieland (6–8 musicians), and small ensemble formats. Each arrangement includes individual parts and conductor score in PDF format.