A concert tour is basically a series of live concerts by an individual or group of musicians in a variety of different venues, towns or countries. These types of concerts are usually named after the town or city in which they are held, or just to identify a certain tour by the said band and to link a specific album or show to that specific concert. Music concerts are quite common among bands, artists, or groups of any kind, and they usually draw crowds of thousands of people. The reason why music concerts are so popular is because the audience gets to listen to the band play their favorite songs for the entire duration of the concert without the need for a break.
Although it is obvious that when you say “concert tour” or “concert” there should be no other words added to the sentence other than the ones associated with the said tour, there are some genres of music that don’t lend themselves well to touring, and when it comes to these kinds of music, the option of performing the entire concert in one place is much more preferable. For example, if you are playing a concert tour of sorts with your band members, you would most likely want to perform your songs in one venue where the majority (nay, all) of the audience will be present. With regards to this kind of scenario, a music concert tour with a single venue can also be called a disambiguation. As such, these kinds of tours may be a bit confusing and sometimes even a little bit pointless.
It should also be noted that regardless of whether a tour incorporates openers or not, a concert tour often makes use of opening acts during its course. The opening acts of a given tour typically highlight or add to the mood of the audience prior to the actual concert starts. Thus, it should be clear that in a concert tour, whether or not opening acts make an appearance depends on the overall theme of the tour, and on the overall arrangement of the tour as a whole.