Caroline Purser/Getty Images What type of music people listen to is reflected in stock markets, Finance professor Alex Edmans says. There is a correlation between the positivity of music and returns, volatility, fund flows and even government bonds. This is because emotions drive decision making and are reflected in music choices, Edmans argues. Sign up here for our daily newsletter, 10 Things Before the Opening Bell. What type of songs you listen to could be reflected in how your stock portfolio performs, as there is evidence of a correlation between the positivity of the music investors listen to and returns, according to Alex Edmans, who is professor of finance at London Business School.Traditional economic belief is that fundamentals impact markets - but humans aren't automated robots, Edmans told Insider in an interview.