Jem Aswad Senior Music EditorEarly 21 st century New York rockers the Yeah Yeah Yeahs — singer Karen O, guitarist Nick Zinner and drummer Jay Chase — have announced new music and tour dates in the summer and fall. The group, which recently signed with indie powerhouse Secretly Canadian, say they will have new music in the fall.The group will play a brace of dates in Europe and Australia in the summer before hitting North America, with dates at New York’s Forest Hills Stadium and the Hollywood Bowl in October, where they will be joined by high school punk rockers the Linda Lindas on both dates and (in Los Angeles) by Japanese Breakfast.