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The lyrics are by Thomas Moore (1779-1852), but the march appears to be an air that was used as a British march during the (American) Revolutionary War period. It may be much older.

    Harp that Once, The

    by Thomas Moore
    The harp that once through Tara’s halls
    its soul of music shed
    Now hangs as mute on Tara’s walls
    as if that soul were fled
    So sleeps the pride of former days
    so glorys thrill is o’er
    and hearts that once beat high for praise
    now feel that pulse no more

    No more to Chiefs and ladies bright
    the harp of Tara swells
    the chord alone that breaks at night
    its tale of ruin tells
    Thus freedom now so seldom wakes
    the only throb she gives
    is when some heart indignant breaks
    to show that she still lives