I have a question regarding musical notation. When changing the clef in the second ending following a repeat sign, should that clef be written in standard size?

GPT-5.4

Vote: Yes

A clef change that takes effect at the start of the second ending is a real, active clef change, not merely a cautionary reminder. Because it determines how the music is read from that point, it should normally be set in full, standard size. Small clefs are typically used as courtesy or cautionary clefs to warn of an upcoming change, often at the end of a system. In contrast, the clef that actually marks the new reading position at the location where the change occurs is written at normal size. The repeat structure does not change that principle. If the new clef begins in the second ending after the repeat sign, the player needs a proper clef indication there, so "Yes" is the stronger answer.

Claude Opus 4.7

Vote: Yes

When a clef change occurs at the start of a second ending (volta) following a repeat sign, it functions as a true clef change for the continuing music, not as a cautionary/courtesy clef at the end of a system. Because the second ending represents new music that the performer plays after taking the repeat, the clef should be written in standard (full) size, just like any clef change at the beginning of a passage. Small (cue-sized) clefs are reserved for cautionary clefs at the end of a system warning of an upcoming change.

Sonar Pro

Vote: No

Based on the search results, when a clef change occurs at or near a repeat sign, including in a second ending, the clef should typically be displayed in a specific manner determined by its position relative to the repeat barline, rather than in standard size as a default rule. According to the MuseScore handbook, 'A clef change which occurs at the same place as a repeat or jump, but which only applies to the music after the repeat or jump (i.e. when continuing, not jumping), is normally placed after the barline.'[4] The search results indicate that clef placement in these contexts is governed by style settings and positioning rules relative to repeat signs, not by standard sizing conventions. In fact, the results discuss 'courtesy clefs' in the context of repeats,[7] which are typically displayed in smaller size to indicate they are reference clefs rather than operative clefs. Therefore, a clef change in a second ending would more likely be a courtesy clef in reduced size rather than standard size.

Grok 4.20

Vote: No

In standard musical notation, clef changes are shown in a reduced size unless they occur at the beginning of a new system. This convention signals a mid-line or mid-section alteration clearly without disrupting the visual flow of the staff. For a second ending after a repeat sign, the clef change applies locally to that volta and follows the repeat barline. Using a smaller clef follows established practice from notation guides, avoids unnecessary space in the ending bracket, and helps performers quickly recognize it as a change rather than a new key signature or system start. Therefore the clef should not be written in standard size.

Kimi K2.5

Vote: Yes

According to standard music engraving conventions (such as those outlined in Elaine Gould's "Behind Bars" and established publishing practices), a clef appearing at the beginning of an alternative ending (volta bracket) should be written in standard size. This is because the second ending functions as a structural beginning for that passage, similar to the start of a new system. The clef must be clearly visible to indicate the change for the performer reading the second ending, just as it would be at the start of any system or after a repeat sign. Only clef changes occurring mid-system (within the flow of measures) are written in reduced size.

Gemini 3.1 Pro

Vote: No

In standard musical notation, full-size (standard-size) clefs are exclusively used at the beginning of a piece and at the start of each new system (line of music). Whenever a clef change occurs mid-system—including when it is placed immediately after a repeat sign at the beginning of a second ending—it is written at a reduced size (typically two-thirds of the standard size). This reduced size helps to visually distinguish the mid-line clef change from an initial system clef and conserves horizontal space on the staff. Therefore, the clef should not be written in standard size.

DeepSeek V3.2

Vote: Yes

In musical notation, clefs are standardized in size to maintain clarity and prevent performer error. This consistency applies across all sections, including repeated passages with alternate endings. Changing the clef size in the second ending could introduce ambiguity, as performers expect uniform notation. Standard size ensures immediate recognition, aligning with established practice. Therefore, the clef should be written in standard size to uphold notation integrity and facilitate accurate performance.

Final Summary

The AI Roundtable was nearly evenly divided over the technical nuances of music engraving, resulting in a narrow 4-3 split. Claude Opus 4.7, GPT-5.4, and Kimi K2.5 argued that because a second ending represents a structural 'new beginning,' the clef should be standard size for maximum clarity; conversely, Gemini 3.1 Pro and Grok 4.20 maintained that any clef change not appearing at the start of a system must be reduced in size to signal a mid-line alteration.

No agreement after 1 rounds of discussion. Final vote: Yes: 4, No: 3

Strongest Arguments

• Yes: A clef change at a second ending functions as a structural beginning for a new passage rather than a cautionary warning, making standard size necessary for clarity and performer recognition.
• No: Standard musical notation strictly reserves full-size clefs for the start of a piece or system, requiring all mid-staff changes to be reduced to approximately two-thirds size to save space and distinguish them from system starts.