"Melor Famagal" was a musical composition, particularly favored by the Ferengi arms dealer Omag. He regularly requested the piece be performed by Amarie in the bar on Qualor II.
His request for a performance helped serve to identify him to Worf in 2368 when the USS Enterprise-D was in orbit of the planet seeking information regarding a stolen Vulcan freighter. (TNG: "Unification II")
The source cue was released as part of the Star Trek: 50th Anniversary Collection (as "Melor Famigal"), which credits Dennis McCarthy with the music, and Rick Berman the lyrics.