A 3/4 beat is normally also known as a Waltz. You count up to ‘3’ in each bar instead of ‘4’ and it has a totally different feel to a normal Straight 8’s beat. Have a go at these simple 3/4 beats and see how you get on. We start off with quarter note based beats and progress to a faster hi-hat or ride cymbal in exercise 3 onwards:
How to Play Simple 3/4 (Waltz) Drum Beats 
Watch this video on YouTube.