vkmusic2 is the second version of vkmusic, a tool to download audio from vk.com.
Unfortunately, it's no longer possible to query the official API to download audio files, so this iteration, unlike the first one, instead does the same things the official web version does, i.e. calls the private API. The downside is in that vkmusic2 requires your login credentials (as apposed to using API tokens) to impersonate the web version. Breakage is also more likely this way.