Peter Aisher began intensive musical training as a chorister at Windsor Castle, where he sang eight services a week with the chapel choir and studied piano and clarinet, although he not-so- secretly wanted to play the saxophone. In his teenage years, he finally got his hands on an alto sax and started studying bass guitar. At sixteen, while at Tonbridge School in Kent, he switched from classical piano to jazz piano, studying with Sean Hargreaves and later Claude Alexander. A year later, he landed his first jazz residency at a local Italian restaurant, Antonia's, where he performed monthly with his trio, Three's Company.

Peter read Astrophysics at Cambridge University, where he was a Choral Scholar at Clare College. During this time, he was heavily involved in the University's music scene. As a vocalist, he was a member of the close harmony group Over The Bridge, writing arrangements for the group and performing in the UK and the US. Peter played bass in and wrote arrangements for Churchill Jazz Band. He was also bassist and later musical director of the Cambridge University Swing Band, appearing with the group on the keyboard on their Croatia tour. As a pianist, Peter was a founding member of the funk group Colonel Spany's Love Ensemble and also appeared on piano and bass in a range of small group ensembles, from duos to septets.

In 2012, after completing his MSc, he took up a postgraduate place at the Royal College of Music, studying voice with Tim Evans-Jones. He won several prizes and graduated with Distinction to join the RCM International Opera School. In 2016, he moved to Germany as a young artist with the Deutsche Oper am Rhein, appearing in around 120 performances across two seasons. Between 2018 and 2022, Peter was a soloist at Landestheater Coburg, where his roles included Tamino in Die Zauberflöte, Ferrando in Così fan tutte, Tom Rakewell in The Rake's Progress, and Edgardo in Lucia di Lammermoor. His operettas include The Pirates of Penzance, Der Vetter aus Dingsda, Wiener Blut and Die Fledermaus. In 2019, he joined the local alternative rock band Black Star on bass and backing vocals. Since 2022, he has worked as a software engineer by day and finally found more time to return to his jazz roots with a monthly residency in Café Victoria in Coburg.