[LAU] Exam Cheating investigation

Hello LAD/LAU members: I teach introduction to western music courses at a local community college, and one thing I have to deal with is students cheating by using a smart phone during the exam.  Sure, I am in the room and occasionally walk down the aisles, but these enterprising students are still often able to hide a smart phone from me. The way these smart phone cheaters are usually caught is when answering an essay question, they usually look up the topic on Wikipedia and copy word for word several sentences. On these exams, there are a few audio identifications, and recently one student did a surprising thing. The audio example was from Pierrot Lunaire, and not only did answer the question by writing down the title and composer but she ALSO WROTE DOWN the title and composer of a track by Webern which was on the original CD that I ripped the Schoenberg from. To summarize, from an mp3/ogg file that was put on-line of one track from a CD, the student was able to identify _other_ tracks from the CD that were not put on-line. How did the student do this?  Here are links to the two sound files that the students had access to: https://www.dropbox.com/s/66qkorouak19gpu/07_20th-pilu_p03_15-18.mp3 https://www.dropbox.com/s/z17qoxey9ju4lei/07_20th-pilu_p03_15-18.ogg Are there some tags embedded in these files?  How would I be able to see these tags myself? If there are no embedded tags, how did this student obtain this information? Thanks;  Ivan