out of left field
... that the first known use of the phrase out of left field in its idiomatic sense was by the American music industry?
... that the first known use of the phrase <b id="mwCOs"><a href="./Out_of_left_field" id="mwCOw" rel="mw:WikiLink" title="Out of left field">out of left field</a></b> in its idiomatic sense was by the American <a href="./Music_industry" id="mwCO0" rel="mw:WikiLink" title="Music industry">music industry</a>?