Following an earlier British model, Mason embarked on producing a hymnal whose tunes would be drawn from the work of European classical composers, such as Haydn and Mozart.
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In 1994, the Music Educators National Conference (MENC) placed Leonhard's name alongside those of William Billings, Lowell Mason, Frances Elliot Clark, Karl Gehrkens, Mabelle Glenn, James Mursell, Lilla Belle Pitts, and Allen Britton in the MENC Hall of Fame.
He left his father's farm at the age of eighteen to study music under Lowell Mason and Thomas Hastings, became organist of a church in New London, Connecticut, in 1857, and in Rochester, New York, in 1859, moved to New York City in 1867, and conducted the "Musical Pioneer," and afterward the New York " Musical Gazette."