When choosing the right electric guitar amplifier for heavy rock music, there are several factors to consider. First, you'll want to look for an amplifier with a high wattage, as heavy rock music typically requires higher volume levels. Additionally, you'll want an amplifier with distortion capabilities, as heavy rock often relies on a gritty, aggressive tone. Look for features such as built-in effects, EQ controls, and gain settings to help you achieve the desired sound.