In some cases, there was some bleed of some other instruments into the channels I selected. Note that I was limited by what was on the multitrack channels. The result is essentially an alternate acoustic version of the album, allowing you to hear it in a new way, and hopefully notice little things you'd missed before. In any case, since these exist, and since I'm a big fan of stripping music back to reveal the acoustic core of songs, I edited these multitracks to create versions of each song that primarily just feature Bowie's voice and guitar. Perhaps because that's such a famous and classic album, it got special attention. When it comes to David Bowie, there aren't many of these multitrack mixes available now, but one great exception is the entire "The Rise and Fall of Ziggy Stardust and the Spiders from Mars" album. In the end, such versions were made for only about 70 Beatles of the 200 or so original Beatles songs.
They had to be created using special new audio forensics technology that had only recently been developed, and that took many months and lots of money. For instance, when a special Beatles version of "Rock Band" was made in 2007, there were no multitrack versions of Beatles songs. It's very hit or miss, and it becomes harder to find this sort of thing the further you go back in time, because the multi-track masters often were not saved. Thanks to these sorts of developments, sometimes it's possible to make mixes of songs where you can strip out one or more of the instruments. Also, some music formats became increasingly popular, such as 5.1 surround sound, which effectively has four music channels instead of the usual two for stereo.
But that started to change with the "Guitar Hero" and "Rock Band" series of computer games, in which mixes were made of famous songs that separated out each of the major instruments, like bass, guitar, drums, vocals, and so on. I'd never even heard of those being available. (And note this is NOT the officially released version of David Bowie's "Ziggy Stardust" album as you know it.) It used to be one could never find multitrack mixes of songs. Here's a type of album I've never posted before.