Bach chorales are timeless, and despite their original intended use for worship services, in the last 250 years or so they have turned out to be models for harmony and counterpoint, exercises for warming up, studies for better intonation, and many other things. These three chorales, each in a different key, are: Song of Thankfulness; Sleepers Wake and How Brightly Shines the Morning Star. They're a nice way to start a concert, lead a procession, warm up the players and more!