tönen
to sound
To emit or produce a tone, sound, or noise. It describes the simple sounding of something.
Aus dem Nebenzimmer tönte leise Musik.
Soft music sounded from the next room.

to sound / to tint / to boast
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to sound
To emit or produce a tone, sound, or noise. It describes the simple sounding of something.
Aus dem Nebenzimmer tönte leise Musik.
Soft music sounded from the next room.

The verb 'tönen' (to sound / to tint / to boast) is closely related to the noun 'der Ton' (tone/sound). This connection helps you understand the meanings 'to make a sound' and 'große Töne von sich geben' (to boast).
Die Glocken der Kirche tönen jeden Sonntag.
The church bells sound every Sunday.
The three meanings can be distinguished well from context: Is it about a sound, hair, or a boastful statement? A sentence about music, hair care, or a person who is showing off makes the meaning clear.
Aus der Ferne tönte ein Horn.
A horn sounded in the distance.
In the meaning 'Haare färben' (to dye/color hair), 'tönen' (to tint) is used reflexively with the dative: 'sich die Haare tönen' (to have one's hair tinted). The person is the subject, and the reflexive pronoun is in the dative.
Sie hat sich die Haare für die Party blond getönt.
She tinted her hair blonde for the party.
When a person 'tönt' (boasts), it means that they say something in a showy or arrogant way. Here the word has a clearly negative coloring.
Er tönte, dass er die Prüfung sicher bestehen würde.
He boasted that he would definitely pass the exam.
to sound
'klingen' and 'tönen' can both mean that something emits a tone or sound. 'klingen' is much more common in everyday language and fits music, voices, noises, or even the impression made by a statement. 'tönen' focuses more on the pure sounding of a tone and often feels somewhat more written or special. In normal conversations, people usually say 'klingen'. 'tönen' fits better when a sound clearly comes from a certain direction or when you want to describe a particular tone.

Aus dem alten Radio tönt leise Musik.
Soft music sounds from the old radio.
Im Konzertsaal klingt das Klavier besonders klar.
In the concert hall, the piano sounds especially clear.