Dear Cornelius,
Thank you for watching, and sorry that it seems confusing, partly because it is a half baked prototype.
The idea is to DIY a kind of Beat-mania game usually found in gaming arcade.
There is an RFID receiver under the black sheet cover and is the drum. The Yubikey is an RFID version and is used as the drumstick.
The RFID receiver is connected to an Arduino board and then to the PC via a serial connection (and also through an ethernet interface, but it turns out the latency is too high for this work so the ethernet connection is abandoned). The PC is running a VB program to handle the signal from the serial connection.
When the RFID received signal from the Yubikey (drum stick hitting the drum), it will transmit a message to the host PC, the VB program will then play a drum sound.
What is in the video is a proof-of-concept. The background music is playing from the PC, and the occasional (off beat) drum sound is the feedback from the action of the drumstick.
The not yet finished part of this project are the gaming elements, like showing the visual cue and counting marks on hitting the at the right rhythm.
If more RFID Yubikey and receivers are available, this could be extended to a full drumstel