The term 'Start of a Refrain' can be represented by two different crossword solutions: TRA and TRALA. TRA is a three letter word that stands for the musical term 'tempo ritardando, ' which means to gradually slow down the tempo of a piece of music. TRALA is a five letter word that stands for the musical term 'tralalala, ' which is a vocal sound used to imitate singing or humming. Both terms are used to indicate the start of a refrain in a piece of music.