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Snap Inc. shares are rallying Monday after the social-media company made strides with its efforts to grow the role of music on Snapchat and expand its relationships in the telecommunications industry.
The company reached a deal with Sony Music Entertainment, in which the label will be able to include music from its artists among the sounds available on the Snapchat app. Snap SNAP already includes songs from other labels, but this arrangement will expand the selection that Snap offers to users who wish to add music to their…