Just as vinyl once gave way to compact discs as the main physical medium for music, could CDs be replaced now by a fingernail-sized memory card? Perhaps not entirely, but SanDisk Corp., four major record labels, and retailers Best Buy and Wal-Mart are hoping that albums sold on microSD memory cards will at least provide an additional stream of sales, reports the Associated Press. The companies were expected to unveil plans Sept. 22 to sell memory cards loaded with music in the MP3 format, free of copy protections. Called "slotMusic," the new format is meant to address two intertwined trends. Most albums are still sold in a physical format—449 million were sold on CDs in 2007, while 50 million were sold digitally, according to Nielsen SoundScan—yet CDs are decreasingly popular. Albums sold on CD dropped almost 19 percent last year. Given this, the record labels are hoping slotMusic can be another physical revenue source—and one that is more versatile than CDs, given the kinds of gadgets people carry around these days. Unlike when the CD was introduced and people had to buy new players, many people already have the ability to play slotMusic albums, because many cell phones and multimedia players support microSD cards. These new albums will come with a small USB dongle that lets buyers use them with computers, too…

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