Josi Cuen and Jorge Medina have achieved their first No. 1 as soloists with their maiden collab “En Tiempo y Forma (Juntos),” which climbs two spots to the top of Billboard’s Regional Mexican Airplay chart (dated June 14).

The song drew 7.5 million audience impressions in the United States May 30-June 5, according to Luminate. That’s a 21% gain compared to the week before. The song earns the chart’s Greatest Gainer honor, given to the track with the largest audience growth among titles at the format.

Cuen and Medina are former members of La Arrolladora Banda El Limón, which boasts 19 Regional Mexican Airplay No. 1s among 39 top 10s in a history on the chart that dates to 2001. Cuen departed the group in 2021, after Medina left in 2017.

“En Tiempo y Forma (Juntos)” was released in December 2024 on Avivar Music. Thanks to the song’s coronation, the label likewise celebrates its first No. 1 on a Billboard chart.

Cuen previously reached a No. 24 Regional Mexican Airplay high as a soloist through “Prefiero Estar Muerto,” with Luis Ángel “El Flaco,” in 2023. Medina posted two prior top 10s, both in 2018, among seven entries.

Elsewhere, Cuen and Medina clock their highest-charting placement on the overall Latin Airplay tally, where “En Tiempo y Forma (Juntos)” bounds 7-2, with nearly all its airplay from regional Mexican stations.

The singers’ first No. 1 on a Billboard chart arrives hot on the heels of their first-ever joint tour, JUNTOS 2025, which launched October 2024 in Mexico. The U.S. leg of the tour kicks off June 12 in San Jose, Calif., and wraps Sept. 13 in Las Vegas.