Gladys Knight & the Pips were together for over 35 years cranking out hits like “I Heard It through the Grapevine” and “Midnight Train to Georgia.” They first charted in 1961 with “Every Beat of My Heart.” Their second hit came in 1962 with “Letter Full of Tears.”  The single is worth up to $25.00. The “Letter Full of Tears” album , released by Fury Records in 1962, can get you $400.00 today.