In its first-quarter 2007 Quarterly Results Conference Call, Apple Inc. executives CFO Peter Oppenheimer and COO Tim Cook made several comments concerning its music-related products, which accounted for 36% of the company’s total revenue in the second fiscal quarter. During his opening remarks, Oppenheimer revealed that Apple’s share of the U.S. MP3 market was 73% for the quarter, according to data from the NPD Group. He also discussed the…