30th Anniversary edition. Definitely Maybe is the debut studio album by Oasis, originally released in 1994. - Oasis' debut album 'Definitely Maybe' celebrates it's 30th anniversary this August. The fastest-ever selling debut in the UK on release, this seminal album marked the point when Oasis became a cultural phenomenon. Including the classic singles 'Supersonic', 'Live Forever' and 'Cigarettes And Alcohol', it's songs sound as fresh and relevant as they did in 1994. Having sold over 6.9 million copies globally, it also sits as the 2nd most streamed album of the 90's (following Oasis' (What's The Story) Morning Glory? at no.1).