Hey!! I love to sing karaoke! Its fun to have parties with the instrumental versions.
I've never even tried it.  Are there special songs you have to sing, or can you sing any song?
. The primary difference between Karaoke and sing-along songs is the absence of the lead vocalist.
Sing-alongs (present since the beginning of singing) fundamentally changed with the introduction of new technology. In the late 1960s and into the 1970s, stored audible materials began to dominate the music recording industry and revolutionized the portability and ease of use of band and instrumental music by musicians and entertainers as the demand for entertainers increased globally. This may have been attributable to the introduction of music cassette tapes, technology that arose
a lot of fun playing with Ragged Robin - the only time in my life I've ever worked with a group - they were tolerant of my inability to know what key I was playing or singing in, or even what chords I was playing [if any]!" 
Track listing.
1. "Hill's of Greenmor" (Traditional arr. Briggs)
2. "Sing a Song for You" (Briggs)
3. "Sovay" (Traditional adapt. Lloyd)
4.