All that can presently (April 2025) be gleaned about the Gerhardt Sisters from sheet music covers and by Internet searching is that they were presumably American actress/singers who have been featured on just one work namely When the Moon Shines in Ireland (1914) music by Bert Peters, words by Marvin Lee and published by Marvin Lee Music Co., Chicago, Illinois, USA| Title | Attribution | Instruments | Source | Remarks |
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When the Moon Shines in Ireland (1914) | B. Peters (music) M. Lee (words) Gerhardt Sisters (perf.) Gerhardt Sisters (perf.) |
Piano, Voice | Indiana Sheet Music Singer |
| Title | Composer | Attribution | Items |
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When the Moon Shines in Ireland (1914) | Bert Peters | Marvin Lee (words)
Gerhardt Sisters (perf.) |