Answer:
kindly check explainations for code 
Explanation:
Check below for program code. 
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Song
{
public:
 void SetNameAndDuration(string songName, int songDuration)
 {
 name = songName;
 duration = songDuration;
 }
 void PrintSong() const
 {
 cout << name << " - " << duration << endl;
 }
 string GetName() const { return name; }
 int GetDuration() const { return duration; }
private:
 string name;
 int duration;
};
class Album
{
public:
 void SetName(string albumName) { name = albumName; }
 void InputSongs();
 void PrintName() const { cout << name << endl; }
 void PrintSongsShorterThan(int songDuration) const;
private:
 string name;
 vector<Song> albumSongs;
};
void Album::InputSongs()
{
 Song currSong;
 string currName;
 int currDuration;
 cin >> currName;
 while (currName != "quit")
 {
 cin >> currDuration;
 currSong.SetNameAndDuration(currName, currDuration);
 albumSongs.push_back(currSong);
 cin >> currName;
 }
}
void Album::PrintSongsShorterThan(int songDuration) const
{
 unsigned int i;
 Song currSong;
 cout << "Songs shorter than " << songDuration << " seconds:" << endl;
 /* Your code goes here */
 for(int i=0; i<albumSongs.size(); i++){
 currSong = albumSongs.at(i);
 if(currSong.GetDuration()<songDuration){
 currSong.PrintSong();
 }
 }
}
int main()
{
 Album musicAlbum;
 string albumName;
 getline(cin, albumName);
 musicAlbum.SetName(albumName);
 musicAlbum.InputSongs();
 musicAlbum.PrintName();
 musicAlbum.PrintSongsShorterThan(210);
 return 0;
}