Sometimes in drum sheet music you will see parts of the music that aren’t written. There may be a space in he music, with an instruction such as ‘develop’, ‘ad lib’, ‘cont. sim’ or ‘fill’. In these examples, there are spaces marked out for drum fills to be played for the duration of 1 beat at the end of the bar.
There are 4 different drum fills to choose from for each exercise. You could pick any fill and mix and match with any exercise.
By learning and playing through these exercises, you will build up an understanding of the type of fills you could add in as short little breaks in the drum beats to add interest to your drumming. 1 beat fills could be used at the end of a section, or during a section of music for a bit of variation in the groove.