'SNL' host Kate McKinnon brings on Kristen Wiig, Maya Rudolph for ABBA spoof and tampon ad - USA TODAY

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"Saturday Night Live" musical guest Billie Eilish wasn't the only one to carry a tune on the show's holiday episode.

Host Kate McKinnon called in backup, her former "SNL" co-stars Kristen Wiig and Maya Rudolph, for a few musical skits.

In one bit, the women were joined by "SNL" cast member Bowen Yang as they spoofed ABBA. Complete with over-the-top flashy outfits and "standing close, facing different directions" for most numbers, the mock Swedish group previewed an unreleased 1978 Christmas album featuring "15 brand new Christmas classics and 85 holiday remakes of their existing songs."

Some of the holiday classic included "Fa La La La" to the tune of "Mama Mia," "Who’s That Baby? (It's the Baby Jesus)" and a "wintry take" on "Chiquitita" called "Frostitita."

"Give yourself the gift of ABBA Christmas perfect for everyone from mothers to their gay sons," infomercial host James Austin Johnson said at the end.

Host Kate McKinnon brought on several former "SNL" stars to help with musical numbers.

The performances continued as McKinnon took the vocal lead in a skit mocking commercials for tampons.

McKinnon was again joined by Rudolph and Wiig for a country music video showing "Tampon Farm," where the menstrual products were produced from trees, the ground and a cranberry bog.

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"Tampon farm / Women making cotton / Cotton for the tampons / Tampons for the blood / Tampon farm / Women with guitars are singing to the tampons / Tampon farm / Sun makes the fires / She hands load the fibers / Into little things of plastic / To go in a jean and the moon makes the menses / And the menses makes the fibers," McKinnon sings in the chorus.

Kate McKinnon sang about growing tampons in a sketch for "SNL."

Several female cast members, including Chloe Fineman and Ego Nwodim, were included in the mock commercial. Eilish also showed off her vocals as she joined for a verse.