Glucose Tolerance Test (GTT). GTT is an abbreviation for Glucose Tolerance Test, which is a measure of the amount of glucose present in the blood stream of a person at the time the test is taken. This test is usually done to check for glucose related problems like hyperglycemia or hypoglycemia in the patient.
Contemporary R&B, also known as simply R&B, is a music genre that combines elements of rhythm and blues, soul, funk, pop, hip hop and dance.
The modern incarnation known specifically as contemporary R&B (also called urban - which they essentially mean to mean African-American or culturally African-American by the radio industry) evolved from disco (1940s R&B became rock and roll and soul music. Soul music gave birth to funk and disco).