These interviews are not only about solo work or B'z. During the past 18 years or so, Be-with magazine, the official fan club magazine has been churning out tons of interviews with the two B'z members, so as you can imagine, Koshi and Tak got to say plenty about other things in life, like food, hobbies, travelling etc.
If you have an impression of Tak Matsumoto being the quiet, solemn member of B'z sitting next to Tamori in the Music Station program, then you are in for a surprise! Tak, despite always letting Koshi handle all the talking in public, is in fact, likes to talk, fuss, and complain a lot. And aptly, as the leader of B'z, or the shacchou, Tak is also very bossy and authorative, in a good way =p