NEW YORK (Reuters) - Music publisher Round Hill Music is expected to announce a deal to acquire the rights to a catalog of 150 songs, including hits by Katy Perry, Flo Rida, Bruno Mars and Cee Lo Green from Arthouse Entertainment LLC, a person close to the situation said. This source said a deal could be announced as soon as Wednesday morning, but declined to comment on its terms. Late last year, Round Hill purchased the rights to a catalog of music containing six songs written and recorded by the Beatles including "She Loves You," "I Saw Her Standing There," and "I Wanna Be Your Man. ...