Remember, you can check the full document Paschale Solemnitatis on this site, among many on the internet.
Not only is the fourth Sunday potentially a John 9 day, but it also “lightens” up the Lenten journey with instrumental music and flowers.
25. On the fourth Sunday of Lent “Laetare” and on solemnities and feasts, musical instruments way be played and the altar decorated with flowers. Rose-coloured vestments may be worn on this Sunday. (Ceremonial of Bishops, 252)
How many parishes bother with this observance? My own sense is that the theme of the initiation Gospels is stronger. Why lighten up for one Sunday of Lent? That kind of question seems to invite more curiosity than edification. But I’m sure it is done well in some faith communities.