Artists · Global Music Power
Roberta Kelly
Charting Jan 14, 1978 → Feb 4, 1978 · 3 weeks with chart power
Charted in 1 of 2 markets — UK Singles Chart 3 wk
Billboard Hot 100 and UK Singles Chart combined, weighted · UK Singles Chart data ends Sep 18, 2026 · How it works
Each week an artist's share is the weighted mean of their Power Share across Billboard Hot 100 ×1 and UK Singles Chart ×0.45 (weights ∝ √population, US = 1). The divisor is every chart's weight, so a number one is worth the same share in any era — and a week before every chart exists, or after one's data ends, sums to less than 100.
UK Singles Chart data runs to Sep 18, 2026; later weeks combine the Billboard Hot 100 only, so their shares — and the most recent years' Era Power — are lower than a full week's would be.
- Peak Power
- 0.06%
- week of Feb 4, 1978
- Career Power
- 1
- share-weeks
- Crowns
- 0
- weeks crowned Artist of the Week
- Peak Year
- 1
- February 1977 – February 1978
- Peak Five Years
- 1
- February 1973 – February 1978
- Top-five weeks
- 0
- weeks ranked 1–5
- Longevity
- 3
- weeks with chart power
- Dominance
- 0.25%
- week of Jan 28, 1978
- Comebacks
- 0
- none detected
Ranked by weekly Power Share, part of the ChartReign Power model — not the chart's own positions. How it works →
Songs on the Global Music Power
1 song · 1 share-weeks of Career Power
Power contributed is what each song earned this artist: their weekly Power Share, split across their songs (a featured credit takes its reduced share). Record Power is the song's own figure, the same for every artist on it. Bar length compares songs within this list. On this combined chart each song's figures are its figures on each market, weighted as the chart weights them, so the list still adds up to Career Power; peaks and weeks are shown per market.
| Song | Peak | Weeks | On chart | Power contributedPower | Record Power |
|---|---|---|---|---|---|
| Zodiacs | #44 | 3 | 0.7 |
At their peak
Roberta Kelly's best twelve months on the Global Music Power ran from February 1977 to February 1978. The most powerful artists over those weeks:
- 1Fleetwood Mac81
- 2Bee Gees75
- 3Shaun Cassidy65
- 4Leo Sayer65
- 5ABBA63
- 6Electric Light Orchestra63
- 7Rita Coolidge62
- 8Barbra Streisand62
- 9Donna Summer60
- 10Andy Gibb60
Ranked by Era Power over the same weeks.