It is the rat tail with gobs of gel and hairspray, and is usually either cleary curled or straightened. This seems to be the hairstyle for men (and some women) here. If you ask me, it is VERY unattractive.
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http://www.youtube.com/watch?v=ZiYEpU80RTo
(The video is horrrrible, don't pay attention to that, its just an idea of what reggaeton sounds like!)
Reggaeton is more "Club" music obviously. SALSA music is much more beautiful and the music that all generations live and breath here.
Here is a very popular Salsa song here that everyone's always singing--some say its the "2009 Salsa Song" called "Yo No Se Manana" by Luis Enrique. Heres the video:
http://www.youtube.com/watch?v=AXIgjQFMCiI