Jimmy Fallon's arrival on "The Tonight Show" is having an unlikely effect on the battle to book big music stars on morning TV's summer concert series. Sources tell Billboard that NBC's "Today" is using Fallon's initial ratings success as leverage in an especially aggressive campaign to win top acts from ABC's "Good Morning America." Both shows are booking 15 concerts that often air on the same days from late May through the end of August, while keeping the lineups close to the vest.

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