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Sentence Correction: Subject Verb Agreement - X of Y Subject

Premiering off-Broadway in 1967, the creators of the musical Hair were songwriting duo James Rado and Gerome Ragni and composer Galt MacDermot, who won a Grammy award for his song African Waltz in 1960.

Incorrect.

This answer choice is grammatically incorrect. The original sentence begins with a modifier: Premiering off-Broadway in 1967. A modifier should be placed right next to the noun it describes. The only noun that this modifier can logically modify is the musical Hair. However, what immediately follows the modifier is the creators and creators cannot premiere.

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect because it is a fragment, lacking a conjugated verb.

The only conjugated verbs in this sentence (won, premiered) are part of relative clauses, (who won..., which premiered), leaving the main clause beginning with the subject Composer Galt Macdermot, without a conjugated verb.

Incorrect.

While this answer choice corrects the Dangling Modifier mistake in the original question, by changing the modifier premiering, etc. to a conjugated verb premiered, it is stylistically flawed.

The pronoun it is ambiguous, as it can refer to either African Waltz or the musical Hair.

Well done!

This answer choice corrects the Dangling Modifier mistake in the original question, by placing the noun being described (the musical Hair) directly after the modifier describing it (Premiering off-Broadway).

Incorrect.

This answer choice is grammatically incorrect.

This answer choice repeats the Dangling Modifier mistake in the original question and creates another grammatical mistake.

The original sentence begins with a modifier: Premiering off-Broadway in 1967. A modifier should be placed right next to the noun it describes. The only noun that this modifier can logically modify is the musical Hair. However, what immediately follows the modifier is songwriting duo and a songwriting duo cannot premiere.

[[snippet]]

In addition, the plural verb were does not agree with the singular subject the songwriting duo (of James Rado and Gerome Ragni).

Premiering off-Broadway in 1967, the creators of the musical Hair were songwriting duo James Rado and Gerome Ragni and composer Galt MacDermot, who won a Grammy award for his song African Waltz in 1960

Composer Galt MacDermot, who won a Grammy award for his song African Waltz in 1960, and songwriting duo James Rado and Gerome Ragni, creators of the musical Hair which premiered off-Broadway in 1967

The musical Hair was created by songwriting duo James Rado and Gerome Ragni and by composer Galt MacDermot, who had won a Grammy award for his song African Waltz in 1960, and it premiered off-Broadway in 1967

Premiering off-Broadway in 1967, the musical Hair was created by composer Galt MacDermot, who had won a Grammy award for his song African Waltz in 1960, and by songwriting duo James Rado and Gerome Ragni

Premiering off Broadway in 1967, the songwriting duo of James Rado and Gerome Ragni were the creators of the musical Hair, along with composer Galt Macdermot, who won a Grammy award for his song African Waltz in 1960