// Make an enumerable of loaded scenes:
var myScenes = Enumerable
	.Range(0, EditorSceneManager.sceneCount)
	.Select(i => EditorSceneManager.GetSceneAt(i));

// Find an enum value by name:
var myEnumType = typeof(MyEnum);
var myEnumValue =
	(from n in Enum.GetNames(myEnumType)
	join v in (int[]) Enum.GetValues(myEnumType) on n equals "MyEnumName"
	select v).First();

// Get all clips in a timeline track:
Func<TrackAsset, double, TimelineClip[]> getClips = null;
getClips = (track, time) =>
	track.GetChildTracks()
	.SelectMany(child => getClips(child, time))
	.Concat(track.GetClips().Where(clip => clip.end > time))
	.OrderBy(clip => clip.start)
	.ToArray();
var myClips = getClips(myTrack, 0.0);