He participated numerous times in Festivali i Këngës as composer and lyricist, winning 2 first prizes in 1966 and 1972.
His father was a known rhapsodist, so from a young age Gaci learned to play multiple instruments, among them guitar, violin, mandolin and accordion.
[4] After finishing elementary school in Shkodër, he studied violin at the Jordan Misja Artistic Lyceum in Tirana from 1948 to 1952.
After returning to Albania he worked as a violin teacher at the Jordan Misja Artistic Lyceum in Tirana.
However his most important work was in vocal music, where he left an unforgettable repertoire, ranging from songs to opera.