"Slash Marks" or "Rhythm Slashes" are diagonal slashes that indicate the actual beats in a measure. This means that a bar of 4/4 time will have four slashes, while a bar of 3/4 time will have three. Slash marks are a valuable tool for writing drum sheet music, as they are flexible and can be used as a placeholder for grooves and fills, and can also carry specific information. SLASH MARKS FOR GROOVES If you encounter a bar of slash marks after a concrete groove example, it's p