die Tournee
tour
A journey by artists, musicians, or athletes during which they perform or compete in different places.
Die Band geht nächsten Sommer auf eine große Europa-Tournee.
The band is going on a big European tour next summer.

tour
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tour
A journey by artists, musicians, or athletes during which they perform or compete in different places.
Die Band geht nächsten Sommer auf eine große Europa-Tournee.
The band is going on a big European tour next summer.

The word 'Tournee' (tour) is very often used in fixed expressions with the preposition 'auf'. The most important ones are 'auf Tournee gehen' (to go on tour) and 'auf Tournee sein' (to be on tour).
Nächstes Jahr geht die Sängerin wieder auf Tournee.
Next year, the singer is going on tour again.
'Tournee' is a loanword from French ('la tournée'). This explains the pronunciation and spelling with '-ee' at the end, which are unusual for German.
Das Orchester beendete seine erfolgreiche Tournee in Paris.
The orchestra ended its successful tour in Paris.
Common verbs combined with 'Tournee' (tour) are 'eine Tournee machen' (to do a tour), 'eine Tournee planen' (to plan a tour), or 'eine Tournee absagen' (to cancel a tour).
Wegen einer Krankheit musste die Band ihre Tournee absagen.
Because of an illness, the band had to cancel its tour.
tour
'die Tour' and 'die Tournee' can mean almost the same thing for artists, musicians, or athletes: they travel from place to place and perform or take part in competitions there. 'Tour' is shorter and very common in everyday language, especially for bands or pop music. 'Tournee' sounds a bit more formal or classical and fits well with theater, orchestras, or larger planned series of performances. The words are easy to confuse because they are often interchangeable in this context. The only important point is: 'Tour' also has other meanings, while 'Tournee' almost always means this kind of performance tour.

Auf der Tournee spielt das Orchester in zehn verschiedenen Städten.
On the tour, the orchestra plays in ten different cities.
Die Band startet ihre neue Tour im Herbst in Berlin.
The band starts its new tour in Berlin in the fall.