Cellist Yo-Yo Ma performs 'Hallelujah' as Montreal crowd sings along - The Globe and Mail

Cellist Yo-Yo Ma performs 'Hallelujah' as Montreal crowd sings along  The Globe and MailCellist Yo-Yo Ma gave a free performance in Montreal's subway system Saturday. Ma ended the 20-minute show by inviting the crowd to sing along with his ...