Why don’t you check the top 50 songs by year before going to Karaoke with co-workers?!
Friday May 18th, 2018 
If you are working in Japan, you will often go to karaoke in a second party etc.
If you sing at karaoke and you can enjoy it with the Japanese, you can enjoy deepening relationship with your business partners.
The difficult thing for foreigners will be choosing a song that will be appreciated by Japanese people.
So, I will teach you the site introducing the ranking of Japanese songs by age.
1950’s Ranking: http://nendai-ryuukou.com/1950/song.html
1960’s Ranking: http://nendai-ryuukou.com/1960/song.html
1970’s Ranking: http://nendai-ryuukou.com/1970/song.html
1980’s Ranking: http://nendai-ryuukou.com/1980/song.html
1990’s Ranking: http://nendai-ryuukou.com/1990/song.html
2000’s Ranking: http://nendai-ryuukou.com/2000/song.html
* You can jump to the ranking of TOP 50 for each year from the link above.
* If you click on each song title, you will be connected to YouTube so you can listen to that song.
The point is “Choose songs that were popular when people going along were around 18 to 22”.
Because people listen to music the most during these ages.
For example, in my case, I often listened music from 1996 to 2000, so I checked the yearly ranking of 1996 to 2000. As a result, I found that each TOP 50 songs by year were very familiar.
If a person going to karaoke with you is around 50 years old, that person may often listens to songs of 1984 to 1988, so it is better to check these pages.
http://nendai-ryuukou.com/1980/song/1984.html
http://nendai-ryuukou.com/1980/song/1985.html
http://nendai-ryuukou.com/1980/song/1986.html
http://nendai-ryuukou.com/1980/song/1987.html
http://nendai-ryuukou.com/1980/song/1988.html
If you know old Japanese songs, it will be a good conversational material. Also, learning the song lyrics is useful for Japanese study.