STEAM integrates five disciplines (S-Science, T-Technology, E-Engineering, A-Art, M-Mathematics) into one cohesive learning paradigm based on real-world applications. Current project with acronym “STEAMus” activities focuses on a different aspects of music technology and has specified objectives that students should understand after completion. Musical instrument research focuses on analyzing the variations between instruments (strings, wood, brass, percussion) and how these differences lead to changes in the spectrum of sound, waveform, and frequency and how the instrument sound is produced. Five schools from five different countries are involved in this 2020-2023 Erasmus+ project: Estonia (Tartu Raatuse School), Italy (L'Istituto Comprensivo LeoneCaetani di Cisterna), Hungary (Csongrádi Batsányi János Gimnázium, Szakgimnázium és Kollégium), Bulgaria (Comprehensive School “Geo Milev”) and Poland (Szkola Podstawowa Zwiazku Nauczycielstwa Polskiego).