More points on Clap Drum Rolls
To get more points on a clapping drum roll, just whistle through it. I pretty sure Kong can't clap faster then that.
On the title screen, you can make the "Press Start" text move by clapping. The "P" in "Press" picks up the more quiet clapping sounds as the "t" in "Start" picks up louder clapping sounds. The Letters in between pick up average rate claps. It acts like a volume graph on a stereo or PC Media player.
Do a song that has many rolls (for example, We Will Rock You or the Pokemon Theme) Those songs have lots easy rolls, and on only Monkey Mode you can at least rack 300.
To get Gorilla Songs just go into Ape Town and purchase them from the Jungle Jam menu. They all cost different prices.