Brusspup is a YouTube channel known for optical illusions and camera tricks. This 2013 video is a straightforward Chladni plate experiment: a tone generator, a wave driver (a lab speaker built for the job) and a square metal plate with sand on top, with each frequency shown on screen as the pattern forms. The equipment was supplied by PASCO scientific, according to the description.
It is useful precisely because it is unadorned. You can pause on any frame and read the frequency, which makes it a handy reference when you are hunting for modes on your own plate. The creator's own favourite pattern is at 5284 Hz, near the end. An unedited version with the tone running throughout is linked from the description for anyone who wants to hear the sweep.
At the time of writing the page shows more than 22 million views. The music over the top is the creator's own track, so the sound you hear is not always the tone driving the plate.