Seventy-six trombones led the big parade, but Sam wasn't marching with them.Sam watched as his brother Mike played his tuba and marched along behind the trombones.Sam watched as his parents played the piano. He watched as his sister Michele played the violin. As Sam watched his family make music, it all looked so easy for them. But, he felt very left out.When he tried the tuba, it wobbled and toppled right over him. When he touched the piano keys...