One of Mark Twains characters said something like, "sitting on a cloud
and playing a harp would be hell

Hi Jrp,

It was the point of view of the recently deceased Captain Stormfield
from the literary classic, "Extract from Captain Stormfield’s Visit to
Heaven" as he describes a series of amusingly disconcerting
revelations about the next world. The line he said was, "Sitting on a
cloud strumming a harp all day turns out to be insufferably
boring...". Read the link below for more details regarding this:

Prometheus Books
"Extract from Captain Stormfield’s Visit to Heaven"
http://www.prometheusbooks.com/site/catalog/book_1272.html

Prometheus Books contact info:
http://www.prometheusbooks.com/site/cont.html

If you want to get a copy of the book, just click on the icons to the
right when you open the first link.

Search strategy:

"sitting on a cloud" "mark twain"
://www.google.com/search?q=%22sitting+on+a+cloud%22+%22mark+twain%22&cat=&hl=en

I hope this helps you. Should you have any comments/questions, please
feel free to post your clarification before rating this and I'll
attend to you as soon as possible. Thanks for asking.

Best regards,
Feilong