Singer in Shibuya

Shibuya is known as a place for young people but I was there the other day at Tower Records because they have a good English book section and I wanted a ひらがな language book for English speakers. This young woman was at the train station singing traditional Japanese songs and there was a group of people gathered around - mostly old folk about my age. I stopped and listened too. I like just about all kinds of music. Is there something I am missing with rap though?

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