Knock! Knock! Groovy Joe, the fun-lovin', guitar-strummin' easy goin' doggy is back and ready for a dance party with you . . . and a whole new math-lovin' doggy crew ! Groovy Joe is totally fun.He's a tail-wagging, song singing party of one!And he rocks like this: Disco party bow wow! #1 New York Times bestsellers Eric Litwin ( Pete the Cat: I Love My White Shoes ) and Tom Lichtenheld ( Goodnight, Goodnight, Construction Site ) are back in another groovy story that will have little ones singing, dancing, and learning math to a whole new beat. In his second book, Groovy Joe has a dance party. But Oh no ! More and more doggies are knocking on his door, asking to come in. Will there be enough room for everyone? Joe knows just what to do and, soon enough, he everyone moving and grooving -- the party has only just begun! Signature rhyme, repetition, and musical writing style, combined with wild and witty illustrations infused and gentle math concepts come together to create an unforgettable new Groovy Joe story all about positivity, creativity, math, and kindness. Groovy Joe is back, ready to get groovy !