Here's a Google Home trick we haven't seen really publicized: the Assistant in Home can play you a six-note scale in any key. (
Note: This does not seem to work on the Pixel Assistant. Sigh. Correction: See update, this is just really broken in general, unfortunately.) Just tell Home to play you any key - for example, "play me a B sharp" - and the Assistant will respond with an ascending six-note scale.