||"Boniní Up" by Chris Gallaher is a great Trombone section feature. This is a medium swing tempo with Basie flavors. Wonderful chart for teaching this style. This trombone section feature is a great easy chart with a most unique jazz improv section for all four trombones. At letter E, each trombone enters at one-measure intervals. In each measure [all four parts], the player can play any rhythm he/she chooses but must play only the one or two written pitches. These written pitches create the chords throughout this improvised section. A most interesting and different effect is heard each time the chart is performed.