Radiohead’s The King of Limbs represents a significant departure in both style and substance from In Rainbows and, ultimately, the idea of “a complete album.”

The new release shifts the band’s definition of the concept, and Radiohead’s industry clout may level a lethal blow to the relics of the LP era.

For loyal fans, it begs the question whether the five Brits are, intentionally or not, simplifying the concept and whether there is more to come soon. The King of Limbs comes in at just 38 minutes and eight tracks. Is it incomplete or — more interestingly — a prelude?

Lead singer Thom Yorke...

Diacetylmorphine
Pharmaceutical-grade heroin. Marketed by Bayer as an over-the-counter cough suppressant in 1898, it’s fairly easy to make with raw opium, some chemicals, and basic lab equipment. The percentage of diacetylmorphine in street heroin can vary based on geographic source; South American wholesale has been falling from a high of 88 percent in 2003. Street purity in the US has been around 35 percent in recent years.

Caffeine
When added in the lab, this results in hard thumbnail-sized “crystals” of heroin, which can be smoked like crack. Add it to powdered heroin and th...