Artists · Billboard Hot 100
Demis Roussos
Charting Jun 3, 1978 → Aug 12, 1978 · 11 weeks with chart power
Charted in 2 of 2 markets · top artist of the week in 1 of them — Billboard Hot 100 11 wk, UK Singles Chart 43 wk (1 at #1)
- Peak Power
- 0.36%
- week of Aug 5, 1978
- Career Power
- 5
- share-weeks
- Weeks at #1
- 0
- weeks as the top artist
- Peak Year
- 5
- August 1977 – August 1978
- Peak Five Years
- 5
- August 1973 – August 1978
- Top-five weeks
- 0
- weeks ranked 1–5
- Longevity
- 11
- weeks with chart power
- Dominance
- 0.72%
- week of Jul 22, 1978
- Comebacks
- 0
- none detected
Ranked by weekly Power Share, part of the ChartReign Power model — not the chart's own positions (config version 4, Sep 21, 2026). How it works →
Exponentially smoothed share of the week's total power (the primary metric).
Songs on the Billboard Hot 100
1 record · 5 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 — a #1 week is 3.5 whoever holds it. Bar length compares songs within this list.
| Song | Peak | Weeks | On chart | Power contributedPower | Record Power |
|---|---|---|---|---|---|
| That Once In A Lifetime | #47 | 11 | 5.1 |