Naman Ramachandran Countryline, the U.K.-based country music fan app backed by Elton John, has announced a strategic partnership with L.A.-based Starlings Entertainment, one of the companies that invested in Oscar-winning biopic “Rocketman.”Starlings is making a cash investment into CountryLine and the companies have agreed a first-look deal to develop film and TV projects that leverage country talent and IP from song to screen.CountryLine has appointed Martha Brass, former CEO of international