i agree with kraftiekortie on talking about music, or anything you genuinely love really. some of the most popular guys i know are guitar players.
you may not even have to approach someone, just go to a park or something and start strumming some tunes, and eventually someone interested might come for a chat.
but don't, don't do what i did and check out and pretend to indulge in an interest that the person likes, for the sole purpose of having something to talk about and share. if you end up genuinely enjoying it, great. it is just so exhausting, pretending to like something you don't just to relate more with someone.
_________________
הייתי צוללת עכשיו למים
הכי, הכי עמוקים
לא לשמוע כלום
לא לדעת כלום
וזה הכל אהובי, זה הכל.