Lukas Nelson, on his way to Stagecoach with Promise of the Real, talks Gaga, Neil Young and serendipity

A young musician has to have a lot on his plate when he takes several minutes to run down his latest endeavors and forgets to mention that he and his group also just happen to be the latest backing band for one of rock music’s biggest and most enduring stars.

“Oh, of course — Neil!” said 29-year-old…