"Mrs. Potato Head" by Melanie Martinez is originally in the key of C# minor, utilizing chords like C#m, B, A, and E. Popular, easy-to-play versions for guitar include using a capo on the 4th fret with Am, C, G, and Em, or using Em, D, C, and G with a capo on the 2nd fret. Mrs Potato Head by Melanie Martinez Chords and Melody