EARTH DAY Music Activities for Elementary Music Lessons. These 20 digital task cards on the BOOM Learning™ website are fun, educational and engaging activities to reinforce the concept of rhythm! Suitable for elementary music sub plans.SAVE WITH A BUNDLE:Music Theory BOOM Cards BUNDLE for EARTH DAYDIGITAL FORMAT:BOOM CARDS are digital, self-checking cards, which means no printing, laminating, cutting, or storing! These digital task cards would be great on laptops, desktops, Chromebooks, tablets,