>without some unique verifiable means of identifying them
I'd have thought that my long-standing Google account, or Android phone would satisfy that requirement. I wouldn't say that I had no intention of signing up, but rather the whole point of a trial is to determine whether I might want to. The selection of artists available is an important differentiator from Spotify or Sony's offering, and I couldn't see any immediate link to that information.
On an off topic but audio-related note: I'm glad to see a new flagship Android phone (hint, not HTC, Samsung, Sony or Motorola) being released week with hardware support for 192Khz 24bit audio playback, and with appropriate APIs to make up for Android's native audio limitations. Existing portable solutions seem to be either unwieldy (iDevice plus camera kit plus external DAC) or expensive (Colorfly).