A group of bus tour operators and travel industry professionals kicked off their annual Marketplace Saturday in downtown Nashville.Over 3,500 people attended The American Bus Association's Marketplace at the Music City Center for the first day of the three-day event."They will do over 100,000 appointments from operator to supplier over the course of three days," said Butch Spyridon, CEO of the Nashville Convention & Visitors Corporation.The American Bus Association represents an $855 billion industry: motor coaches.Locally, the motor coach industry accounts for almost $200,000 in hotel rooms plus a good portion of our city's visitation."The motor coach industry represents about 15 percent of our overall visitation, so in the grand scheme of almost five billion [dollars] per year. It's really important," said Spyridon.Locally, it accounts for almost $200,000 in hotel rooms and about 15 percent of Nashville's annual business.In the opening ceremony, local musicians performed for the crowd. Among them were the Stella, the Fisk Jubilee Singers, and Lennon and Maisy, the daughters from ABC's hit show "Nashville."This is the sixth time the group has selected Nashville to host the event. Spyridon said it is the only city to host the Marketplace more than twice.