Mumford & Sons is an English folk-rock band consisting of 4 members. Formed in 2007, they gained success with their debut album "Sigh No More" in 2009 and have since won numerous awards including the Grammy for Album of the Year. The band engages with fans through various online platforms like their website, Facebook, Twitter, and YouTube where they share band updates, photos, videos, and discuss with fans to build connections. Their active online presence and award recognition demonstrates their ability to develop a strong global fan base.