While collections of Television Music most commonly feature familiar opening theme songs (such as those from Gilligan's Island or The Brady Bunch), they may also comprise incidental music from a series or other performances culled from the program; in recent years, there have also been a number of tribute collections recorded in honor of favorite shows, including Saturday Morning: Cartoon's Greatest Hits (re-recordings of cartoon themes by alternative-rock performers) and Schoolhouse Rock! Rocks (a tribute to the popular animated educational segments of the 1970s).