"Siempre Tú" (English: "Always You") is a song recorded by Mexican singer Axel Muñiz featuring Romanian recording artist Alexandra Stan, released on 21 April 2017 by Warner Music Mexico. It was composed by Muñiz together with its producers Nico Stadi and Mike Green in Los Angeles. "Siempre Tú" has been described as a "contemporary" pop track with electronic influences. It discusses on the theme of love and "how deep it can get with someone, especially when you don't expect it to happen".

The song was met with positive reviews from music critics, who praised its summer vibe and commercial appeal. "Siempre Tú" peaked at number 16 and six on Billboard's Mexico Airplay and Mexico Espanol Airplay charts, respectively. It was promoted by an accompanying music video filmed by Manuel Escalante in Mexico City and Barcelona, presenting Stan and Muñiz virtually walking through the city with virtual reality equipment.

"Siempre Tú" was composed by Muñiz in Los Angeles along with its producers Nico Stadi and Mike Green. It was recorded in the same city at the Pulse Music Group Studios. The idea of the song came to Muñiz after he started to say phrases "like when you think about your girlfriend" accompanied by a piano and an electric guitar. In an interview, the singer stated, "I feel that it is a very Californian song [...] because it is a more proactive and current pop, and the fact that Alexandra Stan recorded a part of the song moved me a lot". On another occasion, he added, "We wanted to do a song with which you can tell a person that you miss her, that you are always thinking about her and longing to be with her. This was the idea of the track". Stan and Muñiz were linked by producer Gabriel Huiban, who previously worked with the latter. "Siempre Tú" was released worldwide on 21 April 2017 through Warner Music Mexico. The accompanying cover artwork shows Muñiz sitting on a chair looking off in the far distance against a backdrop of a street with tall buildings.

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