John Rogers Thomas (1826-1896) was an American composer and music educator, primarily known for his contributions to the genre of parlor music and sacred choral music during the 19th century. He was born in Pennsylvania and became prominent in the latter half of the 1800s, with a career that spanned various aspects of music, including composition, teaching, and conducting. Thomas is best known for his hymn "The Sweet By and By," which has become a staple in American hymnody and is still widely sung in churches today. His works often reflected the romantic sentiments of the time, emphasizing emotional expression and lyrical melodies. In addition to "The Sweet By and By," he wrote numerous other songs, hymns, and arrangements that showcased his skill in blending melodies with accessible harmonies, making them popular among amateur musicians and congregations. His impact on music can be seen in how he contributed to the development of American hymn traditions and parlor songs, which laid the groundwork for future generations of composers and songwriters in the United States. Thomas's legacy endures through the continued performance of his works in both religious and secular contexts.