azizi,
unaccompanied singing was the norm.
but no tradition ,stays static,for example since the 1950s,the gd button accordion has been replaced in popularity by the b/c.
the guitar and bouzouki has gained in popularity as an accompanying instument,the Piano has declined in popularity.
many singers now prefer to have a chordal backing for some songs but still sing unaccompanied for others.
traditions sometimes occurred through economic necessity,people sang unaccompanied because they couldnt afford an instrument,likewise they lilted/sang tunes for dances for the same reason.