When Stephen Sondheim passed away last fall, the world lost one of its greatest composers and lyricists. Sondheim had done it all. He composed music, wrote books and songs — the whole shebang. There were others like him (Irving Berlin, Jerome Kern and Cole Porter) but they were few and far between, and not many from the current crop of emerging songwriters could measure up to him.So, my interest perked up when I heard that a new musical from Canadian-American composer and lyricist Britta Johnson was being heralded by some …