The firm obtained copyrights for national country hits including Little Jimmy Dickens' smash "A-Sleeping at the Foot of the Bed" (1950) and Johnny Mullins' novelty tune "Company's Comin'" (1954).
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In the late 1970s Siman advised Tim Nichols, who later co-wrote Tim McGraw's smash hit "Live Like You Were Dying", and in 1980 urged him to move from Springfield to Nashville.
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Siman's biggest successes came in the late 1960s with songwriter Wayne Carson Thompson, known for "The Letter", "Always On My Mind" and "Soul Deep" (The Box Tops); and he helped such local artists as Ronnie Self and Johnny Mullins ("Blue Kentucky Girl") chart nationally.