hɪz ˈælbəm mˌʌltɪplɪkˈeɪʃən mˈaʊntɪn wʌz ɹᵻlˈiːst ˌɔn dʒˈænjuːˌɛɹi fˈɪftiːn, tˈuː θˈaʊzənd nˈaɪn, ænd ɪn tˈuː θˈaʊzənd twˈɛlv pˈɑːmɚ ɹᵻlˈiːst ɐ dˌiːvˌiːdˈiː ʌv mjˈuːzɪkəl pˈɪktʃɚ bˈʊks.
His album Multiplication Mountain was released on January 15, 2009, and in 2012 Palmer released a DVD of musical picture books.