free but not opensource: Cakewalk, MPC Beats, Tracktion Waveform,... Usually Live Lite the free edition (8 tracks) is bundled with $50 MIDI keyboards, and is

free but not opensource: Cakewalk, MPC Beats, Tracktion Waveform,... Usually Live Lite the free edition (8 tracks) is bundled with $50 MIDI keyboards, and is sufficient to get started with music production, recording and adding a few virtual instruments at least.