While "Alto Sax" is a common instrument, if referring to an arranger, it likely represents a composer or bandleader who specializes in alto saxophone features. This arranger would craft pieces highlighting the alto saxophone's expressive capabilities.
Alto Sax has 12 published jazz band arrangement12} available for instant PDF download at Jazz Band Library.
You can purchase Alto Sax 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.