According to Adam Roberts, the difference between parody and pastiche can be seen by juxtaposing the Sex Pistols’ and Nirvana:

As another example [of the difference between parody and pastiche] we might want to compare the actual, directed anger of ‘punk rock’ as manifested in an album such as the Sex Pistols’ Never Mind the Bollocks with the postmodern directionless emotion of Nirvana’s album Nevermind (an album whose very title seems a laconic, wearied shortening of the Pistols’ original). Kurt Cobain layers the ‘raging’ of punk-influenced guitar noise underneath an ironically detatched vocal persona, ‘ah well, whatever, never mind’. The Sex Pistols parodied British patriotism (‘God Save the Queen, the Fascist Regime’), where Nirvana are all about pastiche. (Fredric Jameson 126).