What are some common 4/4 guitar strumming patterns and how can they be applied in different musical styles?

Common 4/4 guitar strumming patterns include down-up strumming, the "calypso" pattern, and the "rock" pattern. These patterns can be applied in different musical styles by adjusting the speed, emphasis on certain beats, and incorporating variations like palm muting or accents. For example, down-up strumming works well in folk and Pop Music, while the "rock" pattern is commonly used in rock and punk genres.