Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Oleksander Koshetz (September 12, 1875 September 21, 1944) was a Ukrainian choral conductor, arranger, composer, ethnographer, writer, musicologist, and lecturer. He helped popularize Ukrainian music around the world. His name is also commonly transliterated as Oleksandr Koshyts. At one time, a performance of Koshetz s Ukrainian National Chorus held the world record for audience attendance, excluding sporting events. George Gershwin is said to have based his song Summertime on a Ukrainian lullaby, Oi khodyt son, which he heard in a New York City performance by the choir. His performance also popularized Mykola Leontovych's Shchedryk in his concert, which Peter Wilhousky later translated into the immensely popular Carol of the Bells.