
Unfortunately, despite a great deal of critical success, Pet Sounds was the Boys' lowest-selling album (at least initially), contributing to Wilson's Creator Breakdown and the collapse of his follow-up project, Smile. Many of the songs on Pet Sounds are still love songs, but with a more introspective, melancholy tone. The second side of The Beach Boys Today! started to hint at this before the band's masterpiece, Pet Sounds, brought it fully to the fore.

Their early albums were all about love, surfing, and having fun, but after a while Brian Wilson wanted to bring something deeper to their music. The Beach Boys, the Beatles' American rivals, went through a similar progression.And then came a Concept Album, some mindblowing singles (which were shoehorned into an "album," not entirely without filler), followed by a Genre Roulette album.

Following their first not-love-based-singles ("Nowhere Man" and "Paperback Writer"), they recorded with an album that included a Tear Jerker story ("Eleanor Rigby"), a whine about taxes ("Taxman"), a song about drugs disguised as a love song ("Got to Get You Into My Life"), a song praising sleep ("I'm Only Sleeping") and a childish song ("Yellow Submarine"), topped off with a very weird song about the LSD experience via the Tibetan Book of the Dead ("Tomorrow Never Knows"). This made it possible for rock to be considered a serious genre. While the Silly Love Songs never disappeared altogether, their structure and the songs that got mixed in with them changed. The Beatles had a moderate version of this.Most of these albums are regarded as among their best. Their darkest album, however, was The Final Cut, an entirely serious look at the horrors of war. Their following two albums Wish You Were Here (1975) and Animals were about the corrupt music industry and how corrupt society is in general, before they went darker still with The Wall, about a rock-star who secludes himself from the whole world and fantasizes about being a neo-nazi dictator, only lightened up by some humor (Such as in "The Trial", or "One of My Turns"). Then, Roger Waters came to the fore on what is widely considered to be their best album, The Dark Side of the Moon, a dark, cynical concept album about life, tackling themes like insanity ("Brain Damage"), war ("Us and Them") and how time slips by as you get older ("Time"). However, after Syd Barett left due to mental illness and David Gilmour replaced him, the band's lyrics became much more abstract and serious, with pretty much no humor, and the music became darker and more experimental. They started out as a silly Psychedelic Rock band, fronted by Syd Barrett, on their first album The Piper At The Gates of Dawn, whose lyrics were light, whimsical, and often humorous, with songs including "Lucifer Sam" about a cat, "Bike", a Silly Love Song, and "Mathilda Mother" about a mother reading fairy tales. Pink Floyd were one of the most successful examples of this tropes.Note that during the time period of Lighter and Softer punk with Green Day, Billie Joe Armstrong was doing political punk with Pinhead Gunpowder.With Revolution Radio, they've mixed the fun with the politics, so they seem to be trying to split the difference on both.Subverted with their latest project, the Uno! Dos! Trè! Trilogyfrom what the band has said and what we've heard of the songs, they're back to a just-having-fun style reminiscent of The Clash.21st Century Breakdown continued from American Idiot. The fans are now very split up around this.

By American Idiot they instead started focusing on politics and becoming more serious.
