McCartney's luggage revealed a bag containing 219 grams of marijuana, prompting his immediate arrest and eventually cancelling the tour. After a nine-day jail stay, McCartney was released and returned home to his Scottish farm. Deciding to put Wings on hold while he contemplated his future, he now decided to issue his solo recordings from the previous summer. Music and lyrics McCartney II was named in follow-up to his debut album McCartney (1970) because McCartney plays all instruments on both albums; he has also since stated that he had specifically hired a 16-track machine and "a couple of microphones" with which to record this album, adding that he had himself alternately played the drums used in several recording in either the kitchen or bathroom in order to achieve the echo he sought on particular songs. Featuring arrangements that are heavy on synthesisers, McCartney II has been said to represent McCartney's "acceptance of new wave," and has been described as "airless proto-electronica." The album is often experimental, with most of its songs having been described as strange "eccentric synthpop". Although McCartney denies any direct influences on the album, he admired the "eccentricity" and "not-mainstream attitude" of Talking Heads' David Byrne. McCartney was also inspired by experimental composers John Cage, Cornelius Cardew and Luciano Berio; McCartney explained: "I went to their concerts in London because I had plenty of time on my hands so it was the kind of thing I would go and see. Again, just to see what it was about, not necessarily because I was a massive fan. It was more like: what is a prepared piano? Oh, that's what it is. You know, funky stuff like that." According to Stephen Dalton of The Quietus, parts of the album are reminiscent of krautrock and "the whole post-punk disco boom", and described most of the album as "an alluringly weird mash-up of trip-hop, Krautrock and synth-pop." McCartney said that, "rather than me emulating anyone, it was more a question of me seeing what I could do with it. And again, not necessarily thinking I was making an album, just to have some time to experiment. These days I would say that with The Fireman project. So I've always been into that – if you go from 'Tomorrow Never Knows' through McCartney I, McCartney II, The Fireman…" Many of the most synthesised tracks are instrumentals which have been described as ambient; journalist