Both are correct, it just depends upon the meaning you are trying to express. A "trip" implies that the band is going to one destination, while a "tour" indicates that they will be visiting/working in many different pre-scheduled places during the trip. (A "trip" doesn't necessarily mean a person is only headed to one place, though; often someone might mention "I'm taking a trip to the Caribbean." Another person will then ask "Where are you going?" or "What all are you going to see?" and the first person will reply "Our first stop is the Bahamas, then we'll head to the Cayman Islands and then Jamaica.")