Beginning in the mid-1950s, the formerly strict state liquor licensing laws were progressively relaxed and reformed, with the result that pub trading hours were extended. This was in part to eliminate the social problems associated with early closing times—notably the infamous "six o'clock swill"—and the thriving trade in "sly grog" (illicit alcohol sales). More licensed liquor outlets began to appear, including retail "bottle shops" (over-the-counter bottle sales were previously only available at pubs and were strictly controlled). Particularly in Sydney, a new class of licensed premises, the wine bar, appeared; there alcohol could be served on the proviso that it was provided in tandem with a meal. These venues became very popular in the late 1960s and early 1970s and many offered free entertainment, becoming an important facet of the Sydney music scene in that period.