In 1991 Clepsydra released their first album 'Hologram', which was followed by the EP 'Fly Man' in 1993. Clepsydra then signed to InsideOut, who released their second album 'More Grains of Sand' in 1994. This CD included the song “Moonshine on Heights”, which by many is regarded as neo-prog classic. 1994 also saw them performing two songs on national Swiss TV, a rare occurrence for a progressive rock band at that time.
Says Andy, “We had no idea that there was a progressive rock scene. In fact we never heard the expression progressive rock until about three months after the release of Hologram in 1991.”
In 1998 Clepsydra released their third album 'Fears', the first album with Marco Cerulli on guitar. In the wake of the album release Clepsydra had a 10 day long European tour and was booked for a concert in Canada on the strength of this production. In 2001 the band released 'Alone' with Nicola De Vita on bass. This album came with 3 different album covers: "The Chicken", "The Octopus" and "The Fish".
Following these four albums Clepsydra entered a state of hiatus. At this point they had established themselves as a popular entity among fans of neo-progressive rock, and they were often compared to the likes of Jadis, IQ and Fish-era Marillion.
In 2013 Clepsydra announced they were reuniting, with Andy Thommen back on bass guitar and a reunion tour scheduled for 2014.
Says Andy about the reunion, “On Sunday June 23 we met and decided to go for the reunion. The day after we did one single post on facebook announcing the reunion, within 24 hours we had the first 3 concert offers!”