I like both.
Bandcamp, as Brains says, is really solid for offering online sales -- they give you one of the best artist cuts around (they pay direct through Paypal and if you set up or change your Paypal account to micropayments
, it can mean as much as an 75% to 80% artist cut of retail) -- and
they give purchasers options ranging from small, phone friendly Mp3s to truly lossless FLAC or Apple Lossless versions for a price the artist sets. (And they allow purchasers to pay more
if desired, which is awfully nice, since, increasingly, paying for recorded music becomes more like voluntarily throwing a few coins or bills into a busker's open guitar case.)
That said, most
folks probably only really know one online store, and that's iTunes. One ignores that venue at his own risk, perhaps. Runner up is Amazon.
It's relatively easy to sell through Amazon's CreateSpace service [even CD's on demand for the dinosaurs among your customers
] but, while it's supposedly technically possible for an artist to get his stuff up on iTunes for sale himself
, it's such an onerous task jumping through their many hoops [and any undotted i or uncrossed t can cost you months
in terms of release delays, AIUI] that most folks and smaller labels probably pay placement services like TuneCore or use a similar service at ReverbNation (and likely other services as well).
As far as selling online, I recently wrote a pair of articles for my music biz rant blog: From mix file to online store in 3 hours: the rebirth of an album
and Net / Social Checklist for Musicians
But for demos
and stuff your putting up for feedback
and critique, Soundcloud has a couple of nice features.
While Soundcloud's free accounts have some tight restrictions on the number of downloads for a given track (last time I checked it was 100 maximum), their interface, in addition to a 'wave graphic' type timeline/progress bar representation (that can help one visually find one's place in a song, at least unless the song is squashed into tubularity
) it offers the ability for visitors to tag specific comments to specific locations in the song
(or on the timeline,more properly).