Went to a concert today - a solo recital of Schumann’s Carnaval. I drew a few sketches in my Midori Traveler’s Notebook (plain paper and sketch paper) during the concert (very quietly, I assure you). Here are the more successful ones:

Drawn with Pentel GFKP (almost all of it) and Copic Multiliner SP 0.3 black on a plain Midori Traveler’s Notebook refill:

Drawn with Lamy Safari extra fine nib with Pilot Irushizuko Yama Budo ink: