Ysbeidiau Heulog

"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.