What do these songs mean?

Anonymous
Hi! So I just got a simple question really. This guy that I was talking to on a regular basis send me these two songs: U2 - Still haven't found what I'm looking for and Pink Floyd - Wish you were here. He didn't say anything about them, he just send them out of nowhere. Each song alone with a few days apart. I'm just thinking if they had a meaning that I didn't recognize? When do you think you would send these to a friend?
What do these songs mean?
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