| Clue | Source | Date |
|---|---|---|
| Singing quartet assembled by Simon Cowell | ||
| "Amor & Pasión" popera vocal group | LA Times Daily | 23 Apr 2023 |
| “Operatic pop” quartet since 2004 | Wall Street Journal | 13 May 2021 |
| Operatic pop quartet | Wall Street Journal | 24 Apr 2021 |
| Classical crossover quartet formed by Simon Cowell | Jonesin | 15 Sep 2015 |