Katey Sagal, who plays Gemma on FX's Sons of Anarchy, is covering another classic song on Tuesday night's episode of the series and it is now available to listen to before the episode.

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Sagal and the Forest Rangers perform a haunting, minor-toned version of the classic song Greensleeves for the upcoming SOA episode of the same name. The song is available to listen in full on Soundcloud through Rolling Stone and can be heard here.

As with many classic songs covered on the motorcycle drama, Greensleeves will be featured during a montage of Tuesday night's episode.

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The song will be heard during a moment when "there's so much to grieve," series musical supervisor Bob Thiele told Rolling Stone, "and in so many of our montages, there are no words spoken. Only the music and the voice."

As with many songs covered on Sons of Anarchy, the Forest Rangers' arrangement of Greensleeves has a darker edge to it.

"It's happy and hopeful at Christmas time, but that's obviously not what we are looking for here in Charming, much as we wish that were the case," Thiele said. "Traditionally, 'Greensleeves' is in 6/8 time, which suggests a joyful and/or serene mood. So the first thing I did was deconstruct the rhythm, playing it in quarter time, and change harmonic structure to minor as opposed to major in order to get us to the dark side!"

As the series continues to get darker, fans can likely expect even more haunting arrangements of classic songs in the weeks to come.

Sons of Anarchy airs Tuesdays at 10 p.m. ET/PT on FX.

Watch the promo for the next episode of Sons of Anarchy here: