Floren was born to Ole and Tillie Floren. A first-generation American of Norwegian immigrant parentage, he grew up on a farm near
Roslyn in
Day County, South Dakota with two brothers, Arlie and Duane (a.k.a. Dewey), and four sisters, Valborg, Genevieve, Virginia, and Gloria. Before Myron played the accordion he had piano lessons from Dorothy Swenson, his music teacher, who identified with Myron because she also had had
rheumatic fever. He took up playing the accordion at the age of six when his father bought him a $10 mail-order
squeezebox. He taught himself how to play the instrument. He often spent several hours a day using his own methods of study. Soon he was performing solo around the community, often at fairs and social events. After suffering from rheumatic fever as a child, his accordion playing saved his life, as the exertion strengthened his heart back to pre-fever performance. At a 1980 performance at
Norsk Høstfest in
Minot, North Dakota, Floren mentioned that he had a heart valve replacement (from a pig's heart) two years earlier. He worked his way through
Augustana College in
Sioux Falls, South Dakota, by working at radio station
KSOO as "The Melody Man" and teaching accordion in the area. He tried to enlist in the
Army when the United States entered World War II, but was turned down for active duty because of heart damage caused by the rheumatic fever he had suffered as a child. However, he insisted on serving his country by joining the
USO, performing in Europe with notable stars such as
Lily Pons and
Marlene Dietrich. After the war, he returned home to South Dakota, where he married Berdyne Koerner in 1945. The couple eventually had five daughters and gained three sons-in-law and seven grandchildren.
Bobby Burgess from the Welk show was one of his sons-in-law. ==Years with Lawrence Welk==