FlyMachine, which is building a virtual concerts service that lets users chat with friends during the show, raises $21M led by Greycroft Partners and SignalFire (Lucas Matney/TechCrunch)

Lucas Matney / TechCrunch:
FlyMachine, which is building a virtual concerts service that lets users chat with friends during the show, raises $21M led by Greycroft Partners and SignalFire  —  As concerts and live events return to the physical world stateside, many in the tech industry have wondered whether …