What's the meaning of "at employer's election" in the phrase:
Side artist shall perform as a vocalist on the master embodying the performance of main artist for inclusion, at employer's election, on a record to be released for sale to the public.
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It is an odd and legalese way of saying "choice". The employer may choose to include the vocals of the side artist on a record. But the employer is not compelled to do this. Wiktionary lists this meaning as "archaic", but it may have lingered in legal documents.
However I'm not a lawyer, and if you have any concerns on the meaning of a contract you should be hiring a representative.