Uninitiated listeners, of which there are many, and even some tune-book editors have mistaken slides as hornpipes, single jigs, polkas, or double jigs, since slides share various traits with each. Once you know a few, you realize they are distinct from any of those.
The tempo is rather quick, often in the 150 bpm range, if you were to count each heavy-light pair as a beat. But in practice each beat of a slide (counting around 75 bpm now) gets two pulses, which is either a heavy-light pair (very close to an accurate "quarter note, eighth note" distribution) or a quite even triplet – not a jig pattern. Thus if all four group-halves in a bar were triplets – which is uncommon –, you'd have a twelve-note bar. The ratio of heavy-light pairs to triplets in a slide is slightly in favor of the pairs, which again clearly distinguishes them from double jigs. Most slides break the pattern once or twice in a tune by delaying the strong note for a bar's second group until that group's second half, creating a cross-rhythm with respect to the foot taps. Other unique characteristics of slides are not necessary additional information for identifying them – only for playing them!
Note that slides are peculiar to the Southwest of Ireland, and some are directly related to double jigs, single jigs, or hornpipes played elsewhere in Ireland. Musicians quite familiar with slides are generally unfamiliar with single jigs, and some otherwise respectable authorities on the slide have rashly pronounced that single jigs "are the same as slides." We can have some sympathy with that by understanding that these musicians simply use the term "single jig" to mean "slide," and are apparently unaware of the existence of the distinctive "single jig" rhythm in Irish music. Over the course of the 20th century the customary notation for slides shifted from 6/8 to 12/8, which I think is an improvement in accuracy. However, I have given bar counts for slides here according to the 6/8 notation, for the very practical reason that the set dancers count them that way! See Top Ten Slides for examples.
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