A lot of these are just photos ops. We really don't know of they recorded anything or whether Mr. Isley came through and they just vibed. They probably just played each other some records they working on, talked, and that was it. It is possible they recorded something. That's how I view most of these "in the studio" pictures. A lot of times, its not even a session. We've seen it to many times and not just from Dre, but a lot of artists take pictures in the studio and people assume they did a song, but we rarely see confirmation. We see photos and the artists never mention it again.