Which clef is commonly known as the treble clef?

The clef commonly known as the treble clef is indeed referred to as the G clef. This designation originates from its design, which curls around the second line of the staff, indicating that this line represents the note G above middle C. The use of the G clef is prevalent in music for higher-pitched instruments and voices, which often include the flute, violin, trumpet, and soprano voice. Its widespread recognition stems from its role in identifying pitches and providing a framework for reading music in a range that is accessible for many musicians.

In contrast, the other clefs serve different purposes in the musical notation system. The F clef, also known as the bass clef, indicates notes lower than middle C, while the C clef can represent different pitch ranges depending on its placement on the staff — for example, alto or tenor clef. The E clef is not a commonly recognized term within music theory and does not represent a specific clef used in traditional music notation. This further solidifies the G clef's unique identity and utility as the treble clef.