Alone Together, released on 27 April 2020 was performed at the Arena Pula, in Stjepan's hometown of Pula, Croatia, on the Istrian peninsula. The second, also titled Hauser: Alone Together, was performed at Krka National Park, at the Krka Waterfalls in central Croatia. The second video was released on 15 June 2020, to celebrate the artist's 34th birthday. The third, again titled Hauser: Alone Together, was recorded at Fort Lovrijenac in Dubrovnik, Croatia, recognisable to many fans from the HBO series, Game of Thrones. A special 2 disc edition of Hauser Classic is scheduled for October 2020 release. It includes a DVD of the three Hauser: Alone Together videos. The album Hauser plays Morricone premiered on YouTube on 27 October 2020. Collaborations Hauser has worked with cellists such as Mstislav Rostropovich, Bernard Greenhouse, Heinrich Schiff, Frans Helmerson, Arto Noras, Ralph Kirshbaum, Valter Despalj, Philippe Muller, Thomas Demenga, Young-Chang Cho, Reinhard Latzko, Karine Georgian, Roel Dieltiens, and Alexander Ivashkin, to mention a few. In early 2011, Hauser recorded an album with fellow Croatian Damir Urban. The album, the self-titled Urban and Hauser, was released in the summer of 2011. Also in the spring of 2011, he recorded an album with Croatian pop star Oliver Dragojević. The album, Noć nek' tiho svira, was released in October 2011. Also in 2011, they performed together in Pula. That fall, along with fellow 2CELLOS member Luka Šulić, he began touring as a member of the Elton John band. Since then, he has performed with the band hundreds of times, on tour all around the world, and in Las Vegas, Nevada, in the Million Dollar Piano concert performance at the Coliseum at Caesar's Palace. In November 2011, he released another classical album: Brahms, Beethoven & Bruch for Clarinet, Cello & Piano, again with Ms. Misumi, and clarinettist Leslie Craven. In 2018 and 2019, Hauser released a series of videos with Uzbek-American pianist Lola Astanova on social media. Greenwich Trio Together with the Slovenian violinist Lana Trotovsek and Japanese pianist Yoko Misumi, Hauser was a member of the Greenwich Trio, described by cellist Bernard Greenhouse as the "New Beaux Arts Trio". The Trio won a series of first prizes in the international chamber music competitions in the UK, Belgium and Italy. The Greenwich Trio had masterclasses with Amadeus Quartet, Alban Berg Quartet, Guarneri Quartet, Beaux Arts Trio, Trio Fontenay, Menahem Pressler, Bernard Greenhouse, Ivry Gitlis, Stephen Kovacevich,