Unlike the diatonic version, this one plays in all keys, so it can play any song you want! Its buttons resemble those found on a piano keyboard, making them easier to use if you're already familiar with how to play piano. Interestingly, the accordion didn't gain widespread popularity until fairly recently in history. These have fewer notes than the piano-style but often have an attractively bright sound and are easier to learn how to use. Many manufacturers offer accessories such as case covers and straps to make transporting your instrument effortless (and safe).