Start Uykfd

java -jar uykfd-all-X.Y.jar

and then, at the prompt, type the command

read lastfm artists

In an initial installation this should read five artists. Assuming all went well, raise the limit (initially set to 5) and continue reading:

set LASTFM_MAXPOLL 1000
read lastfm artists

which will read the next 1000 artists.

Continue as appropriate until all artists are read. Note that LastFM may not have data for some more obscure artists.

Reading artist data may take some time. Last FM has a limit on the number of requests a program can make per minute. They may also have other restrictions and can ban your API key. It is your responsibility to access their system in a sensible manner.

You can list artists without tags via the command:

show lastfm untagged artists

which will show both the artists and the actual data sent to Last FM (Uykfd automatically "cleans" data, and may sometimes send more than one value to Last FM).

Next: build a graph of artists.