Lyrics of songs are important to take note of, some singers and bands write the words themselves so it has meaning to them and this is what makes the song special. Some artists have people to write their songs for them, but they can write their own lyrics whenever they want to or they may even have written poems that they turn into lyrics. This is especially so when the subject is about love and the likes. All types of popular music must have lyrics and whether there is meaning behind the song or not, it has to come from somewhere; Christian music, folk, rock and even the blues all have to have appropriate words to their songs.
Many artists write all of their music themselves and this is why when you listen to their lyrics of songs it makes the music so much more interesting. Many people also find sanity by listening to some singers music as it might be something they are experiencing and its lets them know that they are not the only ones. An example would be that bands who sing Christian music might not have used poems to get their lyrics together where as the blues might have. It all depends on the artist and what they prefer to do, but all popular music and even music that may not be all that popular must have lyrics to make their music work.
Rock music may not be surrounded by words of love, but you do get the odd rock song that may be leaning in that direction. Either way, all music might not be about love, but they all have their separate ways they like their music to go, so folk and R&B lyrics of songs will be different; that’s just the way the music industry works.