A guitar combo is an amp and speakers housed in the same cabinet. You can choose from small guitar combos for home use and larger for home use and larger tube combos. Popular modeling combos allow you to simulate the sound of well-known guitar amps. When choosing an amp, it's best to consider its future use and select its power rating accordingly. If you will play in a band with a bass guitar and drums, you will need at least a 60-watt combo.