Music has changed over time:

Not only have music styles changed, so has the quality of the production.  Below are links to songs, or song samples, from the 40's to today.  All of these songs would fall under the theme of "love songs".
 


 
"It's Magic" - by Dick Haymes - 1940's
 

"All I have to do is Dream" - by The Everly Brothers - 1950's


"Love Me Do" - by the Beatles - 1960's

 
"Babe" - by Styx - 1970's


"Take My Breath Away" - by Berlin - 1980's

 
"I Will Always Love You" - by Whitney Houston - 1990's


"No Air" - by Jordin Sparks and Chris Brown - 2006