Dad who is more "trendy" will also like some pop songs with a little classical flavor or strong sense of rhythm, or melodious songs, such as Jay Chou's hair as snow, Chrysanthemum Terrace, thousands of miles away, answer straight, Qilixiang, blue and white porcelain, Wang Leehom's big city and little love, rice, oil, salt, vinegar and tea, ah, Jolin Tsai's neighbors with the world, the sun never sets.
some pure music is also ok, depending on the listener's personality. For example, some classic piano music and some saxophone music are suitable for them.
songs in foreign languages. If the father doesn't know foreign languages, it's mainly to listen to the melody to decide whether it's good or not, so find some good songs, such as: Down by the salley gardens; Can you feel the love tonight； My love will get you home; Rhythm of the rain; My love will go on； Such songs are all nice and classic. There are more choices for fathers who can speak foreign languages ~
This is my opinion and recommendation. I hope I can help you, and I hope your father likes it ~~
I wish your father good health!