Indie rock and alternative rock are often used interchangeably. Nevertheless, there are some differences between the genres. Initially, the term "indie" was used for British-based music, whilst "alternative" for American. In 1986, British magazine "NME" released a cassette, "C86", which defined much of the sound of what is today regarded as "indie" music, notably the usage of jangly guitar sounds, retro elements borrowing from 1960s rock bands, and a DIY, amateur-like sound.