A deck with a picture of a music-related word on the front and the name of it in English, Japanese, and phonetic Japanese on the back.
Although many instruments are almost the same in Japanese and English, some are not (like "harpsichord" and "bassoon", for example). Many other words like "quarter note" and "treble clef" are totally different.
More information is available
here. All pictures are in the Public Domain. Feedback welcome.