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Words by C. Mordaunt Spencer, Music by Charles W. Glover, from ‘Irish Music Hall’ Hal Leonard Publishing Co. MCA Music pg. 124.

Wikipedia links to a story which suggests that the song was written by William Pembroke Mulchinock, out of love for Mary O'Connor, a poor maid in service to his family.

    Rose of Tralee, The

    by C. Mordaunt Spencer
    The pale moon was rising a- bove the green mountain
    The sun was de- clining be- neath the blue sea,
    When I stray’d with my love to the pure crystal fountain
    That stands in the beauti- ful vale of Tra- lee

    ( Chorus
    She was lovely and fair
    as the rose of the summer
    Yet ‘twas not her beauty a- lone that won
    Oh, no! ‘twas the truth in her eye ever dawning
    That made me love Mary, the Rose of Tra- lee. )

    The cool shades of evening their mantle were spreading
    And Mary all smiling was listening to me
    The moon through the valley her pale rays was shedding
    When I won the heard of the Rose of Tralee