"Ysbeidiau Heulog" (pronounced [əsˈbəidia(ɨ) ˈhəɨlɔɡ]; English: "Sunny Intervals") is the twelfth single by Super Furry Animals. It was the only single to be taken from the album Mwng and was released as a limited edition 7" vinyl on the band's own Placid Casual label on 1 May 2000. It was the band's first single to chart outside the UK Singles Top 75 peaking at number 89. The Welsh language song has been described by singer Gruff Rhys as "throwaway pop" and likened to the music of ELO, The West Coast Pop Art Experimental Band and Os Mutantes.

Critical reaction to the track was generally positive with some reviewers comparing the song to the work of Roxy Music. The track appears on 2004's singles compilation album Songbook: The Singles, Vol. 1 but is not included on the DVD release as no music video was made.

Singer Gruff Rhys has described "Ysbeidiau Heulog" as "throwaway pop ... old time pop music", likening the song to the work of ELO and going on to claim that it is a tribute to late 1960s pop bands such as The West Coast Pop Art Experimental Band and Os Mutantes. Rhys has stated that his lyrics are about "looking back at a bad time which had the odd good moment" and that "If there's any song that doesn't sum up [Mwng] it's ['Ysbeidiau Heulog']!" The track was recorded in 1999 at Famous Studios, Cardiff and was engineered by Greg Haver. Overdubs were added at Ofn studios, Llanfaelog, Wales with the help of Gorwel Owen who also mixed the song at the studio along with the Super Furry Animals.B-side "Charge" was recorded for an episode of BBC Radio 1's The John Peel Show, which aired on 1 March 2000. The track was produced for the BBC by Simon Askew and engineered by Nick Fountain.

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