For those who don't know, that's Mal Duncan, the not even slightly stereotypical, streetwise, racist-gang fighting, jazz trumpeter who plays at a nightclub called Gabriel's Horn and winds up with the magical horn of Gabriel. As J. Jonah Jameson would say, what are the odds?
Anyway, the Horn does stuff when Mal blows it. Exactly what it does I couldn't tell you; something about extradimensional portals. Maybe Mal is the ancestor of Tyroc, another extradimensional black guy with a traffic-stopping costume and irremediably vague sonic powers? He would be if Bob Rozakis ruled the world, and, oh, what a world that would be.
Simply reading Mal's origin will give you a headache, because it's chockful of proper nouns like Limbo, Gargoyle, Antithesis, Cyberion, Technis, and (my personal favorite) Omegadrome. I swear I used to skate at the Omegadrome when I was in Junior High.
Mal regained his dignity by staying away from the Titans, marrying Karen Beecher (we'll get to her later!), and opening a coffee shop. But now he's out in space with Donna Troy fighting the Enormous Metaphorical Mitts of Alexander Luthor, where, given the extradimensional nature of the problem, he might actually be a great help. Or at least more than Animal Man.