txtDefinition=The {\uldb rhythms}{\v 94537} that immediately precede the strong {\uldb beats}{\v 154397} (called \'93{\uldb downbeats}{\v 159339}\'94) of a {\uldb measure}{\v 86617} or {\uldb phrase}{\v 92038}. Upbeats play an important role in {\uldb K.}{\v 137211} 465, especially in the {\uldb finale}{\v 82354}.