| Quartet | Area of operation | Province | Category |
| 351 Quartet | Portugal | ||
| 4GAMI | Girona | ||
| 4X4 Quartet | Madrid | ||
| Aftershave | Madrid | ||
| Another Try | Madrid | Mixed | |
| Barbersocks | Seville | ||
| Dimension Vocal | Madrid | ||
| Four on the Road | |||
| Four Reasons | Madrid | ||
| Hanfris | Barcelona | ||
| Investigators | Madrid | ||
| MAD Gals | Madrid | ||
| Major Sass | Murcia | ||
| Metropolitan Union | Barcelona | ||
| On the Road Again | Madrid, Seville, Cadiz | Mixed | |
| Poetry and Song | Tavira, Portugal | ||
| Ringsonancia | Seville | ||
| Shiraz | San Cayetano | ||
| Sol Sisters | Madrid | Senior | |
| The Tenors | Mixed | ||
| The Wet Crickets | Cadiz | ||
| Tic Tag Toe | Mixed | ||
| Why Not! Quartet | Mixed |
