The $635 million Music City Center — even in its unfinished state — already has emerged as one of Nashville’s most distinctive (and opinion generating) buildings. It is Nashville’s “widescraper,” and those who like their architecture big and bold must be thrilled. With 1.2 million square feet, a dramatically undulating roofline, towering columns and a northeast corner that is nothing short of breathtaking, the massive building draws attention from locals and visitors alike — their reactions often involving pointing, staring and asking puzzled questions. But as thick as the MCC is, consider this hypothetical: If the building’s total space were squeezed onto the smaller footprint of the AT&T Tower, it would rise about 57 floors. In contrast, the Batman Building contains just 33 floors.