What comprises a set of common standards or social norms in a group, particularly in music?

Cultural convention is the correct choice because it refers to the established norms, practices, and shared values that a group of people, particularly within a specific culture, adhere to in their social interactions, including music. In the context of music, cultural conventions can include specific genres, styles, performance practices, and even etiquette related to music-making and appreciation that are rooted in the history and identity of the culture. These conventions help define what is considered appropriate or desirable within that musical context and facilitate communication and understanding among members of the group.

While social guidelines also relate to expected behaviors within a group, they do not specifically address the artistic or expressive aspects of music. Musical standardization focuses more on the uniformity of music practices rather than the culturally specific norms that guide those practices. Ethnomusicological practice involves the study of music within its cultural context, but it is a method of inquiry rather than a set of norms or standards itself. Therefore, cultural convention effectively captures the essence of shared standards and norms in a musical context.