on that note

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “source?”) The idiom is likely from the musical sense of note.

on that note

1. On the topic that was just previously mentioned.

   I heard there's a lemon shortage. On that note, do we have any lemonade stocked up?

   You've all done a very good job. I'd like to end the meeting on that note. See you Monday.

2. Used other than figuratively or idiomatically: see on,‎ that,‎ note.