"Amazon and Alliance Bernstein. What else can you say?" That's what one member of the Nashville chapter of the Entrepreneurs' Organization said when asked why local entrepreneurs are optimistic Music City will continue to grow in 2019. In fact, 50 percent of local entrepreneurs believe Middle Tennessee's economy will improve over the next year, according to a survey conducted by EO Nashville. Forty-seven percent of respondents think the region's economy will stay the same, while 3 percent think…