Oasis are an English rock band, formed in Manchester in 1991. Led by lead guitarist and primary songwriter Noel Gallagher and his younger brother, lead vocalist and songwriter Liam Gallagher, Oasis are one of the most successful groups to emerge during the Britpop movement of the mid-1990s. In 2005, The Guinness Book Of Hit Singles And Albums declared Oasis the "Most Successful Act of the Last Decade in the UK." Oasis have sold more than 50 million records worldwide, and have had eight UK number one singles. Liam and Noel Gallagher are the only original band members, the present lineup is completed by rhythm/lead guitarist Gem Archer, bass guitarist Andy Bell and drummer Zak Starkey.

With the success of their critically acclaimed debut album, Definitely Maybe (1994), and its even more successful follow-up, the 19 million selling (What's the Story) Morning Glory? (1995), coupled with a rivalry with their contemporary Blur, Oasis attained fame in the mid-1990s, and became one of the leaders of the Britpop movement. The Gallagher brothers featured regularly in tabloid newspaper stories, and cultivated a reputation as both bad boys and a band of the people.