noodle
"improvisation" is the formal term
the slang term is "jamming"or "to noodle"
Messing around, or playing random things, generally with other people, or by yourself is called jamming.
As in, "When I was a kid my dream was to jam with Jimi Hendrix and his band?" or "My boyfriend and his band were jamming all night and I couldn't get any sleep?"
improv, jammin ,noodle
Guitar is a musical instrument
A synonym for "manual" in the context of a musical instrument is "keyboard." This term typically refers to the set of keys that a musician interacts with to produce sound, particularly in instruments like pianos and organs.
ostinato.
MIDI is an interface and protocol to connect musical instruments; it stands for musical instrument digital interface.
It is a slang term for the word money It is a slang term for the word money It is a slang term for the word money is a slang term for the word money is a slang term for the word money
Panpipes
A bellist is a rare term for a person who rings bells, especially when as part of a musical instrument ensemble.
Hindi language has a single word 'saaz' for 'musical instrument'.
There is no slang term for oxygen.
"Diddle" can have different meanings depending on the context. It can be a slang term for cheating or swindling someone, or it can refer to moving quickly and lightly. It is also a term for playing a simple tune on a musical instrument.
Another term for ad lib is improv, or improvise.
Bellybutton IS the slang term for the navel.