This is the 15954th most frequent Polish word.
towarzyszącym
"Accompanying" or "attending."
Here, 'towarzysząca' is an adjective derived from the verb 'towarzyszyć'. It describes the music that accompanies the ceremonies, functioning attributively to the noun 'muzyka'.
Muzyka towarzysząca ceremoniom jest bardzo nastrojowa.
The music accompanying the ceremonies is very atmospheric.
In this sentence, 'towarzyszącym' functions as an adjective, relating to 'uczestnikom' to indicate the action of accompanying, modifying the noun it refers to in the context.
Towarzyszącym wszystkim uczestnikom był dobry nastrój.
All participants were accompanied by a good mood.
Here, 'towarzyszący' again serves as an adjective describing the group, indicating their role of accompanying the main artists during the event.