The secret of The Goo Goo Dolls’ music may be that there’s no secret. The band’s songs really are workmanlike – nothing ground-breaking. They simply convey emotions – the emotions of us all – wrapped up in stirring music, so that you can easily relate to them. Oh, and they’re performed well. They were  performed extremely well – 23 of them -- in a 95-minute show Tuesday at Sovereign Performing Arts Center in Reading.It was clear early in the show that it was a good night for The Goos – especially front man Johnny Rzeznik. And with the Goo Goo Dolls, how Rzeznik does determines