The word that best completes the sentence is "recording."
Explanation:
1. In the context of the sentence, we are talking about music playing one after another. This indicates a sequence of songs being played, which is usually done through a recording.
2. A "recording" refers to a reproduction of sounds stored in a physical or digital format that can be played back. In this case, the music is playing in a sequence, which fits the concept of songs being played from a recording.
3. The other options, "wax," "nubble," and "kingpin," do not make sense in the context of playing songs one after another. "Wax" could be associated with vinyl records, but the most fitting and logical choice is "recording" to complete the sentence appropriately.
Therefore, the word "recording" best completes the sentence as it aligns with the concept of music playing one after another in a sequence.
