My dad is a whistler. There isn’t a day that goes by that you will hear a tune or two while he works. He always seems to have a song in his heart. When my husband and I first started in the ministry, the pastor that we worked under was always humming a song. We often joked, because, even while eating at the table, if he was enjoying his meal, he hummed while he ate!  🥰😂 Again, he always had a song in his heart.  I have a best friend that constantly wakes up with a song in her heart. Even before she asks the Lord for it, He has already given it to her! 🤪 She has a song in her heart!!!