The Lollapalooza rumor mill has been buzzing for weeks, and five of the six headliners are nearing confirmation for the Aug. 6-8 festival in Grant Park, according to music-industry sources with knowledge of the negotiations: Lady Gaga, a reunited Soundgarden, Green Day, Arcade Fire and the Strokes.

Gaga, Soundgarden and Green Day were named Tuesday by the Daily Swarm, a music Web site that cited “multiple industry sources” in its report.

The Tribune has learned from its own sources that negotiations are progressing with Arcade Fire and the Strokes. The Lollapalooza lineup also will include several coveted rising bands, including Yeasayer, the xx, and Dirty Projectors, as well as veteran dance-oriented acts Cut Copy and Hot Chip, sources have confirmed.

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