Piet Koopmans, Harry van der Velde & Piet van Gorp, three accordion players met in 1940 and started this trio.
Their first recording dates 1946.
They did release 48 shellac 78rpm records, a hard to count amount of singles, EP’s, 10s and LP’s.
Not surprising with 65 medleys in their repertoire.
Very successful in the Netherlands and many gigs abroad.

In the mid 60’s Jaap Valkhoff became a part-time member, often replacing the ill-healthed Piet Koopmans.
After Piet died in 1971, he became full time member.

This outfit stopped in 1977. (Also the year Harry van de Velde died.)