What does the term 'con' mean in musical terms?

The term 'con' in musical terminology generally translates to 'with.' Therefore, when it's paired with another word in Italian, it indicates a way of performing the music that reflects the characteristic of that second word. In this case, 'con vigor' translates to 'with vigor or spirit.' This indicates that the performer should play the music energetically and with enthusiasm.

In contrast, the other options present different interpretations that do not align with the standard usage of 'con' in this context. For instance, 'with motion' would be represented by the term 'con moto,' while the idea of playing 'with fire or fury' would typically be conveyed through expressions like 'con fuoco,' and 'in a singing style' could be denoted by 'cantabile.' Each of these terms has its unique connotation and does not directly convey the same meaning as 'con vigor.'