Manchester City star Jack Grealish has taken to Instagram to hail Rangers icon Scott Arfield for his guitar skills at MLS side Charlotte FC. The 35-year-old ex-Canadian international – who left Rangers for the USA after a five-year stint in the summer – has been serenading his teammates in North Carolina. In a video uploaded to Instagram, the talented guitar player was clipped singing Bobby McFerrin classic Don’t Worry, Be Happy and Ben E. King song Stand By Me in the Charlotte FC canteen. The clip then caught the attention of Manchester City attacker Jack Grealish, who took to Instagram to ap…