My response:
Wrong, Stephenk!
Now, I finally GOT you! In your example, the recording of the music is "incidental" to the videotaping of, for example, a marital reception party; e.g., it is not purposeful for the purpose of the music itself, but rather in our writer's example, it is purposeful for the sale of his CD's. In other words, our writer's CD is "enhanced" for the purpose of making his CD more salable as opposed to his competitor's similar sale.
Also, there is a choice in our writer's situation; i.e., to knowingly and "willfully" place a copyrighted material onto another, unintended, format; whereas, in your wedding reception scenario, there is no choice to "stop the music" or "stop the band" from playing, especially when the videographer is taking footage of the happy couple's "first dance" - - without music, there would be no "first dance".
Also, there's the issue of "fair use" in your wedding reception example. For instance, it is rare the time when an entire piece of music is video recorded to tape. However, it is widely known, and accepted in our culture that music is played at receptions and that sometimes, it's recorded onto another medium, and such recording would be, and is, considered fair use.
Additionally, the videotape and service of the videographer is pre-sold to a wedding couple, regardless of music. The intent of the videographer or the happy couple is NOT to record music; rather, the intent of the videotape is to film the Ceremony and Reception. The music thusly captured is "incidental", and the videotaping would happen regardless of the inclusion or absence of music.
Therefore, the recording of music on videotape at a wedding reception is "incidental" to the footage being taped, and is "fair use". It is NOT a purposeful, and an intentional act as in the case of our writer who is selling his CD's to make them more pleasing and salable.
And last, but certainly not the least, our writer would be transfering the music, purposefully, to a different, unauthorized, and unlicensed medium and, when copies are made for all the relatives, has actually "induced" and "enabled" a copyright infringement when the CD's are distributed with the music. Also, when the the video portion of the CD is not within sight, the musical audio still plays to the ears of all of these various relative non-purchasers!
IAAL