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Duh.

Well - it took me a minute, but I misunderstood that the original "end" was not to cap my "if" - I was missing the "end" cap for the "if".

 Problem:

 require 'csv'

total_sales = 0
CSV.foreach('sales-data.csv', headers: true, converters: :all) do |row|  # TODO: check if category is "Music" (row[2])  # TODO: if it is music, add total_sales + the row's sales (row[6])end
puts total_sales.round(2)

 Solution:

 require 'csv'

total_sales = 0

CSV.foreach('sales-data.csv', headers: true, converters: :all) do |row|
  if row[2] == "Music"
  total_sales = total_sales + row[6]
  end
end

puts total_sales.round(2)

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