Not to bring down the mood on such a beautiful day, but it’s only a matter of time (probably only a few weeks) before this temperate sunshine gives way to the lazy summer doldrums. And when that day comes, the perfect salve, as always, will be the music of Bonnie Prince Billy, the long-running project of singer-songwriter Will Oldham. Combining alt-folk and country influences into a down-tempo songs ideal for a rustic setting, Bonnie Prince Billy has received gobs of critical praise since beginning in the 1990s. Hot on the heels of this year’s Beware album on the Drag City label, Bonnie Prince Billy is playing Friday night at the Troc along with likeminded openers Old Calf (the duo of Will’s brother Ned and Matty Metcalfe). We’ve got two tickets…you know the drill: To enter to win, email ihopeiwin[at]philebrity[dot]com with “BPrinceB” in the subject header. You’ll automatically be subscribed to the new Philebrity Reader weekly newsletter and win chances for other exclusive free stuff. Winners will be picked Thursday, so be sure to check your electronic mail.