Rok, I believe that there would be agreement among most arrangers that a minimum size for the designation “big band” is 5 saxophones, 3 trombones, 3 trumpets and 3 rhythm (piano, bass and drums). Anything much smaller than that (fewer horns) would make it what is usually referred to as “small big band”. This number of horns (11) gives arrangers enough “voices” for a fairly complete expression of most arranging techniques that are typically used in the genre. However, I would say that if there is a “standard” size as defined by the most common size of big band it would be 5 saxophones, 3 trombones, 4 (!) trumpets and 3 rhythm. As you point out that is what Wynton uses at JALC.
“17 piece big band” is a more generous or complete use of instrumental “voices” by the arranger and is a carry over from a time when band leaders could afford a larger ensemble in order to have a fuller and bigger sound. Typically, the trombone section gets one more (4) and guitar is added for a total of 17 players.
“17 piece big band” is a more generous or complete use of instrumental “voices” by the arranger and is a carry over from a time when band leaders could afford a larger ensemble in order to have a fuller and bigger sound. Typically, the trombone section gets one more (4) and guitar is added for a total of 17 players.