This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 123456]

▼CElement
CBeam
CLayoutBreak	Symbols for line break, page break etc
CNote	Graphic representation of a note
CMScore
▼CMuseScoreView
CScoreView	This is an GUI element to show a score
▼CQmlPlugin
CPluginAPI	Main class of the plugins framework. Named as `MuseScore` in QML
▼CQObject
CChannel	Provides an access to channel properties
CCursor	Cursor can be used by plugins to manipulate the score
CExcerpt
CFileIO	Provides a simple API to perform file reading and writing operations
CFractionWrapper	Fraction object available to QML plugins
CInstrument
CMStyle	Provides an access to score style settings
CPlayEvent
▼CScoreElement	Base class for most of object wrappers exposed to QML
▼CElement
▼CDurationElement
▼CChordRest
CChord
CTuplet
CMeasure
CNote
CPage
CSegment
CTie	Provides access to internal Ms::Tie objects
CPart
CScore
CStaff
CSelection
CStringData
▼CQProcess
CMsProcess	Start an external program. Available in QML as `QProcess`
▼CQQmlListProperty
CQmlExcerptsListAccess< T, Container >
CQmlListAccess< T, Container >	QML access to containers
CQmlPlayEventsListAccess
▼CQQmlPropertyMap
CEnum	Wrapper for enumerations
▼CQQuickPaintedItem
CScoreView	This is an GUI element to show a score
▼CSymbol
CNoteHead
▼CTextBase
CLyrics