Clock → Deskclock
Camera → Nikita GCam
Gallery → Simple Gallery
Music → VLC
Notes → Editor
I was on the brink of (falsely) claiming “there was/is no default Music app”, but realized upon checking that I had deactivated Music early on – with a 200+ GB music library on your SD card, you just don’t want a music app that keeps auto-scanning your SD storage. Love VLC.
For why the default Clock app didn’t meet my nerdy needs 
see Minor bug in stopwatch display?