Is it possible to share an account between two people? The last time I tried it it was not possible, but that was a long time ago. Also, is there an Android client, or app or something?

Lubricating the cork in a saxophone neck or a clarinet tenon. It turned out to be not a good idea at all, since the Vaseline speaks into the cork and dissolves the glue holding the cork to the instrument. But until then it does a great job.