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This paper reviews approaches to speech rhythm which is defined as patterned recurrences of events in time. The paper provides a bird eyes’ review that earlier failed attempts to rhythm metrics which have been devoted to finding periodicity led to the conceptual shift that speech is not isochronous and that the rhythm of a language is the product of its linguistic structure such as syllable structure, vowel reduction, and accent-induced lengthening. It is also summarized that quantitative and stochastic approaches to linguistic rhythm has been accompanied by the conceptual shift, and that various rhythmic metrics such C, %V, and Δ PVI are proposed. The paper ends with the suggestions that much endeavor needs to be made in order to find rhythmic constancy by including wider phonetic features such as locating rhythmic domains, finding an automatized way of locating stress or accents in the stretch of speech signals, and including pitch, intensity, and spectral features as well as the consonantal and vocalic durations.