Done gigs in 2012:

- Jensey Lima dos Santos - Hierdeis Bossa Duo in Amsterdam
- DUODUO feat. Julia Philippens in Amsterdam
- McTwo in Amstelveen
- RAISA Trio with Sven Schuster and Bart Rozemeijer @ Strandtent Brakers in Noordwijk aan Zee
- AKKI HAAK BAND... CD presentation tour with gigs in Amsterdam and Leiden
- MAIWALD HIERDEIS DUO @ Jazzbrunch Hotel Americain Amsterdam
- "Originals Only Trio" with Emiel Wienholts(sax.) and Dave Sahanaja (db.) at Bar Lempicka in Amsterdam
- The LOTZ/HIERDEIS Project at Muziekpodium Badcuyp in Amsterdam
- Amstel Bigband feat.Anton Goudsmit ("Boy Edgar Prize" in 2010) at "de Fuut" in Scheveningen, The Haag
- Trio with Henri�tte(voc.) and Thomas Winter Andersen (db.) in Barneveld
- Lotz/Hierdeis Project at the "De twee spieghels" in Leiden
- CD presentation at a the radioshow "Mijke's Middag" with the Amstel Big Band
- Zoot Ensemble in Zaandam (NL) and Brussel (B)
- Jan Verwey Trio in a Cafe in Amsterdam
- BigBand Concours in Hoofddorp
- Amstel Bigband at "Lantaren Venster" for the Jazzdag in Rotterdam
- Mc Two in Restaurant Tespelduin, Noordwijkerhout
- Arthur Heuwekemeijer Quartet with Arthur (tsax.), Timothy Brandsen (db.) and Gijs Dijkhuizen (drs.)
- Sam Halbertsma Trio with Sam (b.) and Eduardo Blanco (tp.) at a opening of a "Estafette Biological Shop" in Amsterdam, Bos en Lommer
- Jazztrio with Katrin Kögel (voc.) and Michael Stratz (db.) at Frenzis Amsterdam
- Jamsession opener with Gerlinde Esser (voc.) and Michael Stratz (db.) in Amsterdam.
- "CottonClub" in Amsterdam (Nieuwe Markt 5) with Dick Verbeek (drs.), Anton Drukker (b.) and Efraim Trujillo (sax.)