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Phrase-level prosodic prominence in American English is understood, in the AM tradition, to be marked by pitch accents. While such prominences are characterized via tonal labels in ToBI (e.g. H*), their cues are not exclusively in the pitch domain: timing, loudness and voice quality are known to contribute to prominence perception. All of these cues occur with a wide degree of variability in naturally produced speech, and this variation may be informative. In this study, we advance towards a system of explicit labelling of individual cues to prosodic structure, here focusing on phrase-level prominence. We examine correlations between the presence of a set of 6 cues to prominence (relating to segment duration, loudness, and non-modal phonation, in addition to f0) and pitch accent labels in a corpus of ToBI-labelled American English speech. Results suggest that tokens with more cues are more likely to receive a pitch accent label.