Four alcohol brands – Patron tequila, Hennessy cognac, Grey Goose vodka, and Jack Daniel’s whiskey – accounted for more than half of alcohol brand mentions in the songs that mentioned alcohol use in Billboard’s most popular song lists in 2009, 2010, and 2011, according to a new study from researchers at the Boston University School of Public Health and the Center on Alcohol Marketing and Youth (CAMY) at the Johns Hopkins Bloomberg School of Public Health.