Round Hill Music has acquired the writer and majority co-publishing shares of Johnny Rzeznik of the Goo Goo Dolls' songwriting catalog in a deal that sources say cost about $18 million.That catalog includes such Goo Goo Doll hits as "Iris," "Name," "Slide," "Black Balloon" and "Better Days" and fan favorites like "Domino" and "Only One."The deal, first reported by Music Business Worldwide, initially includes Rzeznik’s writer share and co-publishing ownership -- which accounts for about 70-75% of