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Could you explain to me why one verb is present perfect and the other one past simple? Here is the sentence:
This band has recently toured with X and they did a radio session with Y.
Why aren't both verbs past simple? Is it because they may tour again with X but they won't do another radio session with Y (kind of one off)? or is it because they did a radio session before touring?
Although it is grammatically correct to mix tenses that way (notice that the writer did use "they" to give "did" its own subject), it might sound better with matching tenses. But I don't buy the argument about major versus minor; the tense implies no such thing. Using "has recently toured" simply means they went on one or more tours. However, mentioning the touring first could be taken to imply the touring was more worthy of mention—but not necessarily.
If you think the tenses should match, consider "The band has recently toured with X and done a radio show with Y." (notice how with matching tenses, leaving out "they" seems normal; "has" spans "toured" and "done".) Or, if the radio show preceded the touring and was not recent: "The band has done a radio show with Y[,] and [they] recently toured with X."
This sentence structure may seem somewhat "unbalanced" to you, however as it turns out, the present perfect is sometimes used to announce something, e.g. a victory, achievement, or on the contrary - a mishap, disaster.
Germany has won the World Cup! (the use of the simple past here would render this a simple fact, with no apparent sense of accomplishment, excitement, newsworthiness.
The market has crashed! (=not good news!)
I've solved the riddle! (=finally!)
Perhaps the speaker in your sentence viewed touring with X as a major accomplishment for the band, and the radio session just a "factoid."
