To clarify brain activities related to salience of birdsong in noisy environments, magnetoencephalographic (MEG) activities and subjective salience induced by 6 birdsongs in 3 noisy environments were measured. The scale values of subjective salience of birdsongs in noisy conditions were also measured using the paired-comparison tests. The sparse regression analysis revealed that the power of the induced alpha (8–13 Hz) in the frontal region, and induced gamma (30–50 Hz) in the parietal region. The power of the frontal alpha and parietal gamma activities significantly changed across birds and noise conditions, respectively. These results indicate that the induced frontal alpha and parietal gamma activities are related to salience of birdsong and environmental noise, respectively.