<P> As a vocalist , Charles , along with Julia Rinker Miller , sang the theme song to the television series Three 's Company ( `` Come and Knock on Our Door '' ) . As a songwriter , Charles was best known for the choral anthem `` Fifty Nifty United States '' in which he set the names of the states to music in alphabetical order . It was originally written for The Perry Como Show . He is also known for `` Letters , We Get Letters '' , also originally written for Como 's show and later used on the Late Show with David Letterman . </P>
<P> As a vocalist , Charles , along with Julia Rinker Miller , sang the theme song to the television series Three 's Company ( `` Come and Knock on Our Door '' ) . As a songwriter , Charles was best known for the choral anthem `` Fifty Nifty United States '' in which he set the names of the states to music in alphabetical order . It was originally written for The Perry Como Show . He is also known for `` Letters , We Get Letters '' , also originally written for Como 's show and later used on the Late Show with David Letterman . </P>
who sings the theme song for three 's company
who sings the theme song for three 's company
Charles Julia Rinker Miller
Charles Julia Rinker Miller