What Christmas song has the initials rosb?

The Christmas song with the initials "ROSB" is "Rudolph the Red-Nosed Reindeer." This classic holiday song tells the story of Rudolph, a reindeer with a glowing red nose, who is initially ostracized but ultimately becomes a hero by guiding Santa's sleigh. First popularized in the 1940s, it has since become a beloved staple of Christmas Music.