It would depend on what Oldies you played as to whether a Christian audience would be offended. Lay Lady Lay, I Can't Get No Satisfaction, Midnight at the Oasis are three that jump out as potential problems and there are plenty others that have drug associations or sexual overtones that would offend many if not most Christians. Any song that makes suggestions of even giving the appearance of wrongdoing would be offensive and not good choices for your Oldies playlist.
It doesn't help that many artists from that time period weren't moral people much less Christians (the Beatles got into Eastern religions even though they wrote some great music,but you've got to listen to the lyrics for example: Imagine there's no heaven.... or religion too, My Sweet Lord singing praises to Hari Chresna (sp)), and many artists then were drug users. Again, I say target a secular station for secular audiences and a Christian station for Christians.
It doesn't help that many artists from that time period weren't moral people much less Christians (the Beatles got into Eastern religions even though they wrote some great music,but you've got to listen to the lyrics for example: Imagine there's no heaven.... or religion too, My Sweet Lord singing praises to Hari Chresna (sp)), and many artists then were drug users. Again, I say target a secular station for secular audiences and a Christian station for Christians.