Digital payments firm Square said Thursday it was buying a controlling stake in the streaming music platform Tidal from a group led by rap star Jay-Z for $297 million in cash and stock. "The acquisition extends Square's purpose of economic empowerment to a new vertical: musicians," said a statement from Square, the finance tech firm led by Jack Dorsey, who is also the chief executive of Twitter. "It comes down to one simple idea: finding new ways for artists to support their work," said Dorsey. "New ideas are found at intersections, and we believe there's a compelling one between music and the economy." rl/st